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  &lt;title&gt;TÃ¬m hiá»ƒu vá» cÃ¡c font toÃ¡n dÃ¹ng TeX vÃ&nbsp; LaTeX&lt;/title&gt;
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  \title{TÃ¬m hiá»ƒu vá» cÃ¡c font toÃ¡n miá»…n phÃ­ dÃ¹ng Ä‘Æ°á»£c  vá»›i  \TeX{} vÃ&nbsp; \LaTeX{}%
  \footnote{Báº£n quyá»n nÄƒm 2006 thuá»™c Stephen G.\  Hartke.  Báº¡n cÃ³ quyá»n phÃ¢n phá»‘i láº¡i nguyÃªn vÄƒn tÃ&nbsp;i liá»‡u nÃ&nbsp;y hoáº·c cÃ³ thá»ƒ  thay Ä‘á»•i ná»™i dung cá»§a tÃ&nbsp;i liá»‡u.\protect \\ PhiÃªn báº£n Ä‘áº§u tiÃªn cá»§a bÃ&nbsp;i bÃ¡o Ä‘Ã£ xuáº¥t hiá»‡n trÃªn  \emph{The Prac\TeX{} Journal,} 1, 2006,  \protect\url{http://www.tug.org/pracjourn/2006-1/hartke/}.\protect \\
  Trang chá»§ cá»§a bÃ&nbsp;i bÃ¡o nÃ&nbsp;y náº±m á»Ÿ \protect\url{http://ctan.tug.org/tex-archive/info/Free_Math_Font_Survey}.}}
  \author{Stephen G. Hartke\footnote{Email: lastname @ gmail dot com.}\\[0.2cm]
  Vietnamese translation by: ThÃ¡i PhÃº KhÃ¡nh HÃ²a\footnote{Email: h2vnteam@gmail dot com.}}
  \date{\vntoday}
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\title{TÃ¬m hiá»ƒu vá» cÃ¡c font toÃ¡n miá»…n phÃ­ dÃ¹ng Ä‘Æ°á»£c  vá»›i  \TeX{} vÃ&nbsp; \LaTeX{}%
\footnote{Báº£n quyá»n nÄƒm 2006 thuá»™c Stephen G.\  Hartke.  Báº¡n cÃ³ quyá»n phÃ¢n phá»‘i láº¡i nguyÃªn vÄƒn tÃ&nbsp;i liá»‡u nÃ&nbsp;y hoáº·c cÃ³ thá»ƒ  thay Ä‘á»•i ná»™i dung cá»§a tÃ&nbsp;i liá»‡u.\protect \\ PhiÃªn báº£n Ä‘áº§u tiÃªn cá»§a bÃ&nbsp;i bÃ¡o Ä‘Ã£ xuáº¥t hiá»‡n trÃªn  \emph{The Prac\TeX{} Journal,} 1, 2006,  \protect\url{http://www.tug.org/pracjourn/2006-1/hartke/}.\protect \\
 Trang chá»§ cá»§a bÃ&nbsp;i bÃ¡o nÃ&nbsp;y náº±m á»Ÿ \protect\url{http://ctan.tug.org/tex-archive/info/Free_Math_Font_Survey}.}}


\author{Stephen G. Hartke\footnote{Email: lastname @ gmail dot com.}\\[0.2cm]
  Vietnamese: ThÃ¡i PhÃº KhÃ¡nh HÃ²a\footnote{Email: h2vnteam@gmail dot com.}}
  \date{\vntoday}

\maketitle
\begin{comment}
TiÃªu Ä‘á», tÃ¡c giáº£ vÃ&nbsp; ngÃ&nbsp;y thÃ¡ng Ä‘Æ°á»£c Ä‘áº·t trong  preamble cho HeVeA.
\end{comment}
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\textbf{Note:} \emph{TÃ&nbsp;i liá»‡u nÃ&nbsp;y cÅ©ng cÃ³ má»™t báº£n copy á»Ÿ Ä‘á»‹nh dáº¡ng \href{surveyvn.pdf}{PDF}
format.}\medskip

\end{htmlonly}


\section*{Ná»™i dung gá»“m cÃ³}

\noindent \hyperref[sec:Intro]{\textbf{Giá»›i thiá»‡u}}\begin{latexonly}\hfill\textbf{\pageref{sec:Intro}}\end{latexonly}

\noindent \hyperref[sec:TeXFonts]{\textbf{CÃ¡c font ban Ä‘áº§u Ä‘Æ°á»£c thiáº¿t káº¿ Ä‘á»ƒ dÃ¹ng vá»›i \TeX{}}}\begin{latexonly}\hfill\textbf{\pageref{sec:TeXFonts}}\end{latexonly}

\begin{quote}
\hyperref[fig:CM]{Computer Modern}, \hyperref[fig:CMBright]{CM
Bright}, \hyperref[fig:ConcEuler]{Concrete and Euler}, \hyperref[fig:ConcMath]{Concrete
Math}, \hyperref[fig:Iwona]{Iwona}, \hyperref[fig:Kurier]{Kurier},
\hyperref[fig:AntPolt]{Antykwa P\'o\l{}tawskiego}, \hyperref[fig:AntTor]{Antykwa
Toru\acuten{}ska}
\end{quote}
\noindent \hyperref[sec:PSFonts]{\textbf{CÃ¡c font PostScript ná»“ng cá»‘t}}\begin{latexonly}\hfill\textbf{\pageref{sec:PSFonts}}\end{latexonly}

\begin{quote}
\hyperref[fig:Kerkis]{Kerkis}, \hyperref[fig:Millen]{Millennial},
\hyperref[fig:fouriernc]{fouriernc}, \hyperref[fig:pxfonts]{pxfonts},
\hyperref[fig:Pazo]{Pazo}, \hyperref[fig:mathpple]{mathpple},
\hyperref[fig:txfonts]{txfonts}, \hyperref[fig:Belleek]{Belleek},
\hyperref[fig:mathptmx]{mathptmx}, \hyperref[fig:mbtimes]{mbtimes}
\end{quote}
\noindent \hyperref[sec:OtherFonts]{\textbf{CÃ¡c font khÃ¡c}}\begin{latexonly}\hfill\textbf{\pageref{sec:OtherFonts}}\end{latexonly}

\begin{quote}
\hyperref[fig:Arev]{Arev Sans}, \hyperref[fig:chartermd]{Math Design
vá»›i Charter}, \hyperref[fig:comicsans]{Comic Sans}, \hyperref[fig:garamd]{Math
Design vá»›i Garamond}, \hyperref[fig:fourier]{Fourier-GUTenberg},
\hyperref[fig:utopiamd]{Math Design vá»›i Utopia}
\end{quote}
\noindent \hyperref[sec:Compar]{\textbf{So sÃ¡nh cÃ¡c Ä‘áº·c Ä‘iá»ƒm}}\begin{latexonly}\hfill\textbf{\pageref{sec:Compar}}\end{latexonly}

\noindent \hyperref[sec:Creation]{\textbf{Thá»±c hiá»‡n bÃ&nbsp;i kháº£o sÃ¡t nÃ&nbsp;y nÃ&nbsp;y}}\begin{latexonly}\hfill\textbf{\pageref{sec:Creation}}\end{latexonly}


\section*{Giá»›i thiá»‡u vá» báº£n dá»‹ch}
ÄÃ¢y lÃ&nbsp; báº£n tiáº¿ng Viá»‡t cá»§a tÃ&nbsp;i liá»‡u
\href{http://www.tug.org/tex-archive/info/Free_Math_Font_Survey/}
{Free Math Font Survey} do ThÃ¡i PhÃº KhÃ¡nh HÃ²a dá»‹ch, riÃªng pháº§n vÃ­ dá»¥ máº«u
font do NgÃ´ Quang HÆ°ng dá»‹ch.

\section{\label{sec:Intro}Giá»›i thiá»‡u}

Má»™t trong nhá»¯ng thÃ¡ch tá»©c lá»›n nháº¥t trong viá»‡c lá»±a chá»n má»™t font nÃ&nbsp;o Ä‘Ã³ Ä‘á»ƒ dÃ¹ng vá»›i \TeX{} hoáº·c \LaTeX{}  lÃ&nbsp; khÃ´ng cÃ³ nhiá»u font toÃ¡n khá»›p vá»›i cÃ¡c font dÃ¹ng cho vÄƒn báº£n\footnote{Hiá»‡n nay font dÃ¹ng cho vÄƒn báº£n thuáº§n thÃ¬ cÃ³ ráº¥t nhiá»u.} thuáº§n khiáº¿t. CÃ¡ch giáº£i quyáº¿t há»£p lÃ½  lÃ&nbsp; dÃ¹ng cÃ¡c font  Postscript Type~1 vá»›i \TeX{} cho mÃ´i trÆ°á»ng vÄƒn báº£n (xem tÃ&nbsp;i liá»‡u  Font
Installation Guide cá»§a Philipp Lehman~\cite{CTANfontinstgd}) tuy nhiÃªn viá»‡c quy hoáº¡ch vÃ&nbsp; Ä‘á»“ng bá»™ hÃ³a cÃ¡c font toÃ¡n cho phÃ¹ há»£p vá»›i font cá»§a vÄƒn báº£n sáºµn cÃ³  lÃ&nbsp; Ä‘iá»u ráº¥t cáº§n thiáº¿t vÃ¬ cÃ³ ráº¥t Ã­t font toÃ¡n trong \TeX{} mÃ&nbsp; Ä‘áº·c biá»‡t lÃ&nbsp; cÃ¡c font miá»…n phÃ­. Tháº­t ra thÃ¬ trong vÃ²ng máº¥y nÄƒm qua, ngÆ°á»i ta Ä‘Ã£ cÃ´ng bá»‘ má»™t sá»‘ font toÃ¡n cÃ³ cháº¥t lÆ°á»£n cao. Má»¥c Ä‘Ã­ch cá»§a bÃ&nbsp;i viáº¿t nÃ&nbsp;y lÃ&nbsp; liá»‡t kÃª táº¥t cáº£ cÃ¡c font toÃ¡n miá»…n phÃ­ vÃ&nbsp; nÃªu ra cÃ¡c vÃ­ dá»¥ minh há»a Ä‘á»ƒ báº¡n tiá»‡n theo dÃµi.

{}``Miá»…n phÃ­'' á»Ÿ Ä‘Ã¢y cÃ³ nghÄ©a lÃ&nbsp; tá»± do  sá»­ dá»¥ng (cho má»¥c Ä‘Ã­ch cÃ¡ nhÃ¢n hoáº·c má»¥c Ä‘Ã­ch thÆ°Æ¡ng máº¡i) vÃ&nbsp; tá»± do phÃ¢n phá»‘i nhÆ°ng khÃ´ng nháº¥t thiáº¿t pháº£i cáº£i biáº¿n chÃºng. TÃ´i cÅ©ng Ä‘Ã£ cÃ³ Ã½ Ä‘á»‹nh liá»‡t kÃª táº¥t cáº£ cÃ¡c font cÃ³ báº£n phÃ¡c tháº£o á»Ÿ Ä‘á»‹nh dáº¡ng PostScript Type~1, thÃ­ch há»£p Ä‘á»ƒ nhÃºng vÃ&nbsp;o  cÃ¡c file tÃ&nbsp;i liá»‡u dáº¡ng Postscript PS hoáº·c Adobe Acrobat PDF. Ban Ä‘áº§u  Donald E. Knuth Ä‘Ã£ thiáº¿t káº¿ ra há»‡  \MF\ nháº±m táº¡o ra cÃ¡c font bitmap dÃ¹ng cho \TeX{}. Tuy nhiÃªn khi nhÃºng cÃ¡c font bitmap vÃ&nbsp;o cÃ¡c file tÃ&nbsp;i liá»‡u dáº¡ng PS hoáº·c PDF\footnote{Báº¯t Ä‘áº§u tá»« version 6, thÃ¬  Adobe Acrobat Reader hiá»ƒn thá»‹ cÃ¡c font bitmap khÃ¡ á»•n.  CÃ¡c trÃ¬nh duyá»‡t PDF khÃ¡c nhÆ°  Ghostview vÃ&nbsp; xpdf  thÃ¬ cÃ¡c font bitmap luÃ´n hiá»ƒn thá»‹  chÃ­nh xÃ¡c.} thÃ¬ chÃºng hiá»ƒn thá»‹ lÃªn mÃ&nbsp;n hÃ¬nh khÃ´ng tá»‘t láº¯m vÃ&nbsp; cÃ³ thá»ƒ tháº¥y rÃµ Ä‘iá»u nÃ&nbsp;y khi in vá»›i Ä‘á»™ phÃ¢n giáº£i cao. Ká»ƒ tá»« khi mÃ&nbsp; cÃ¡c font outline\footnote{nÃ©t ngoÃ&nbsp;i,  nÃ©t phÃ¡c tháº£o, hÃ¬nh dÃ¡ng bÃªn ngoÃ&nbsp;i} cÃ³ thÃªm cÃ¡c Ä‘Æ°á»ng cong  mÃ´ phá»ng  cho má»—i  dáº¥u cá»§a font toÃ¡n thÃ¬ chÃºng váº«n giá»¯ nguyÃªn cháº¥t lÆ°á»£ng hÃ¬nh áº£nh khi xem á»Ÿ cÃ¡c Ä‘á»™ phÃ¢n giáº£i khÃ¡c nhau.

CÃ¡c font liá»‡t kÃª á»Ÿ Ä‘Ã¢y Ä‘Æ°á»£c phÃ¢n loáº¡i theo xuáº¥t xá»© cá»§a chÃºng: tÃ¹y thuá»™c vÃ&nbsp;o viá»‡c chÃºng Ä‘Æ°á»£c thiáº¿t káº¿ cho \TeX{} hay cÃ³ liÃªn quan Ä‘áº¿n cÃ¡c font Postscript chuáº©n hoáº·c lÃ&nbsp; cÃ¡c font miá»…n phÃ­ khÃ¡c. Xuáº¥t xá»© cá»§a má»™t font khÃ´ng liÃªn quan Ä‘áº¿n cháº¥t lÆ°á»£ng cá»§a nÃ³ hay tÃ­nh thÃ­ch há»£p cho viá»‡c soáº¡n tháº£o cÃ¡c cÃ´ng thá»©c toÃ¡n. KhÃ´ng cÃ³ sá»± Ä‘Ã¡nh giÃ¡ hay lá»i giá»›i thiá»‡u nÃ&nbsp;o cho cÃ¡c font Ä‘Æ°á»£c liá»‡t kÃª trong tÃ&nbsp;i liá»‡u nÃ&nbsp;y vÃ&nbsp; tÃ¹y theo cáº£m nháº­n cá»§a ngÆ°á»i dÃ¹ng mÃ&nbsp; há» tá»± Ä‘Ã¡nh giÃ¡ cho cháº¥t lÆ°á»£ng cá»§a cÃ¡c font. Má»¥c Ä‘Ã­ch cá»§a bÃ&nbsp;i viáº¿t nÃ&nbsp;y Ä‘Æ¡n giáº£n chá»‰ lÃ&nbsp; giá»›i thiá»‡u vá»›i báº¡n cÃ¡c font toÃ¡n, cÃ²n viá»‡c cÃ³ sá»­ dá»¥ng chÃºng hay khÃ´ng Ä‘Ã³ lÃ&nbsp; lá»±a chá»n cá»§a báº¡n.


Khai bÃ¡o cÃ¡c gÃ³i font cÃ³ liÃªn quan trong pháº§n preamble\footnote{\emph{preamble} lÃ&nbsp; pháº§n Ä‘á»©ng sau ``\texttt{\textbackslash{}documentclass\{\}}'' vÃ&nbsp; Ä‘á»©ng trÆ°á»›c  ``\texttt{\textbackslash{}begin\{document\}}'' } cá»§a tÃ&nbsp;i liá»‡u \LaTeX{}. Trong cÃ¡c tiÃªu Ä‘á» cá»§a cÃ¡c hÃ¬nh lÃ&nbsp;m  vÃ­ dá»¥ cÃ³ ghi rÃµ cÃ¡c lá»‡nh dÃ¹ng Ä‘á»ƒ khai bÃ¡o cho cÃ¡c font tÆ°Æ¡ng á»©ng, vÃ­ dá»¥: {}``\texttt{\textbackslash{}usepackage\{fourier\}}'' lÃ&nbsp; lá»‡nh khai bÃ¡o Ä‘á»ƒ dÃ¹ng cÃ¡c font Utopia vÃ&nbsp; Fourier-GUTenberg, xem minh há»a cá»§a file \LaTeX{} trong pháº§n ~\ref{sec:Creation}.

Walter A. Schmidt cÅ©ng cÃ³ má»™t bÃ&nbsp;i kháº£o sÃ¡t vá» cÃ¡c font toÃ¡n báº±ng tiáº¿ng Äá»©c~\cite{WASmathfonts} nhÆ°ng Ã´ng  chá»§ yáº¿u táº­p trung vÃ&nbsp;o cÃ¡c font thÆ°Æ¡ng máº¡i. Kháº£o sÃ¡t cá»§a  Schmidt cÃ³ nhiá»u vÃ­ dá»¥ cho tháº¥y sá»± khÃ¡c biá»‡t giá»¯a cÃ¡c cáº·p font toÃ¡n vÃ&nbsp; font dÃ¹ng cho vÄƒn báº£n thÆ°á»ng.

\section{\label{sec:TeXFonts}CÃ¡c font sÆ¡ khai Ä‘Æ°á»£c thiáº¿t káº¿  cho \TeX{}}
Nhá»¯ng font nÃ&nbsp;y lÃºc Ä‘áº§u Ä‘Æ°á»£c thiáº¿t káº¿ Ä‘á»ƒ dÃ¹ng vá»›i \TeX{} sá»­ dá»¥ng \MF\  hoáº·c chÆ°Æ¡ng trÃ¬nh MetaType1~\cite{CTANmetatype1}.



\paragraph{ Font Computer Modern:}
Knuth Ä‘Ã£ táº¡o Computer Modern~\cite{CMBook} lÃ&nbsp;m font máº·c Ä‘á»‹nh cho \TeX{}. Bá»™ font nÃ&nbsp;y bao gá»“m  serif, sans serif vÃ&nbsp; cÃ¡c diá»‡n máº¡o vÄƒn báº£n Ä‘Æ¡n khoáº£ng cÃ¡ch, cá»™ng thÃªm cÃ¡c font toÃ¡n tÆ°Æ¡ng á»©ng trong Ä‘Ã³  bá»™ font kÃ½ hiá»‡u lÃ&nbsp; tÆ°Æ¡ng Ä‘á»‘i hoÃ&nbsp;n chá»‰nh. Computer Modern lÃ&nbsp; \emph{bá»™ font} dÃ&nbsp;nh cho TeX{} mÃ&nbsp; ngÆ°á»i ta nÃ³i ráº±ng chÃºng Ä‘Æ°á»£c sá»­ dá»¥ng quÃ¡ liá»u cho cÃ¡c tÃ&nbsp;i liá»‡u (font bá»‹ láº¡m dá»¥ng \texttt{:(})), cÃ³ má»™t sá»‘ kÃ½ tá»±  khi dÃ¹ng á»Ÿ cá»¡ nhá» thÃ¬ trÃ´ng ráº¥t gáº§y vÃ&nbsp; nháº¡t nÃªn ráº¥t khÃ³ Ä‘á»c trÃªn mÃ&nbsp;n hÃ¬nh hay khi Ä‘Æ°á»£c in tá»« cÃ¡c mÃ¡y in laser cÃ³ Ä‘á»™ phÃ¢n giáº£i cao.%
\footnote{Khi hiá»ƒn thá»‹ trÃªn mÃ&nbsp;n hÃ¬nh cÃ¡c font nÃ&nbsp;y thÆ°á»ng cÃ³ hiá»‡n tÆ°á»£ng rÄƒng cÆ°a xuáº¥t hiá»‡n, hay bá»‹  xÃ¡m má», bá»Ÿi vÃ¬ cÃ¡c  nÃ©t khÃ´ng Ä‘á»§ lá»›n Ä‘á»ƒ  phá»§ kÃ­n má»™t pixel. Khi in vá»›i má»™t mÃ¡y in laser cÃ³ Ä‘á»™ phÃ¢n giáº£i cao thÃ¬ font hiá»ƒn thá»‹ ráº¥t rÃµ nÃ©t, nhÆ°ng tÃ´i nghÄ© chÃºng quÃ¡ má»ng (\emph{gáº§y}). Khi in vá»›i má»™t mÃ¡y in cÃ³ Ä‘á»™ phÃ¢n giáº£i trung bÃ¬nh nhÆ°  mÃ¡y injet, thÃ¬ Ä‘á»™ phÃ¢n giáº£i cá»§a nÃ³ vá»«a Ä‘á»§ Ä‘á»ƒ  hiá»ƒn thá»‹ hÃ¬nh dÃ¡ng cá»§a cÃ¡c máº«u tá»±, nhÆ°ng khi in á»Ÿ Ä‘á»™ phÃ¢n giáº£i tháº¥p thÃ¬ cÃ¡c máº«u tá»± xuáº¥t hiá»‡n tá»‘i hÆ¡n (\emph{Ä‘áº­m hÆ¡n má»™t chÃºt so vá»›i khi in vá»›i mÃ¡y in cÃ³ Ä‘á»™ phÃ¢n giáº£i cao}) } Theo quan sÃ¡t cá»§a Raph Levien~\cite{CMRgain} thÃ¬ báº£n in trong \emph{Digital Typography}~\cite{DigTyp} cá»§a Knuth cÃ³ pháº§n Ä‘áº­m hÆ¡n báº£n in tá»« má»™t mÃ¡y laser.

CÃ¡c phiÃªn báº£n Type~1 cá»§a Computer Modern  tá»«  Blue Sky Research vÃ&nbsp; Y\&amp;Y,
Inc. Ä‘Æ°á»£c  Há»™i ToÃ¡n Há»c Má»¹\footnote{American Mathematical
Society (AMS)}, cÃ¡c nhÃ&nbsp; xuáº¥t báº£n vÃ&nbsp; cÃ¡c cÃ´ng ty ká»¹ thuáº­t khÃ¡c~\cite{CTANbluesky,bluesky} phÃ¢n phá»‘i miá»…n phÃ­. 
Basil K. Malyshev cÅ©ng Ä‘Ã£ cÃ´ng bá»‘ miá»…n phÃ­  má»™t phiÃªn báº£n Type~1 cá»§a Computer Modern~\cite{CTANbakoma}  Ä‘á»ƒ dÃ¹ng vá»›i há»‡ \TeX{} cá»§a Ã´ng ta, há»‡  BaKoMa \TeX{}.

Computer Modern Ä‘ang dáº§n Ä‘Æ°á»£c má»Ÿ rá»™ng nháº±m má»¥c Ä‘Ã­ch thÃªm cÃ¡c kÃ½ tá»± má»›i, Ä‘áº·c biá»‡t dÃ¹ng cho cÃ¡c ngÃ´n ngá»¯ khÃ´ng pháº£i lÃ&nbsp; tiáº¿ng Anh vÃ&nbsp; ChÃ¢u Ã‚u. CÃ¡c font nÃ&nbsp;y bao gá»“m European Computer
Modern cá»§a J\"org Knappen vÃ&nbsp; Norbert Schwarz (chá»‰ cÃ³ á»Ÿ dáº¡ng \MF{}) \cite{CTANec}; Tt2001 cá»§a Szab\'o P\'eter (DÃ¹ng  \texttt{textrace} Ä‘á»ƒ chuyá»ƒn tá»« nguá»“n \MF\  sang Ä‘á»‹nh dáº¡ng Type~1;  nay thÃ¬ CM-Super Ä‘Ã£ tháº¿ chá»— cho Tt2001; CM-Super cá»§a  Vladimir Volovich (dÃ¹ng \texttt{textrace} \cite{CM-Super,CTANcm-super} Ä‘á»ƒ chuyá»ƒn Ä‘á»•i) vÃ&nbsp; Latin Modern cá»§a  Bogus\l{}aw Jackowski \&amp; Janusz M. Nowacki (má»Ÿ rá»™ng tá»« font  Blue Sky AMS  báº±ng MetaType1)  \cite{LatinModern,CTANlm}.  Computer Modern Ä‘Ã£ Ä‘Æ°á»£c HÃ&nbsp;n Tháº¿  ThÃ&nbsp;nh viá»‡t hÃ³a vÃ&nbsp; cÃ³ tÃªn VNR lÃ&nbsp; font máº·c Ä‘á»‹nh cá»§a \htmladdnormallink{Vn\TeX{}}{http://vntex.org}.

Font \texttt{lcmss} dÃ¹ng vá»›i Sli\TeX{}  lÃ&nbsp; má»™t font vÄƒn báº£n cÃ³ cÃ¡c máº«u tá»±  rá»™ng chiá»u ngang vÃ&nbsp; cao tÃ­nh theo chá»¯ cÃ¡i `\emph{x}'  thuá»™c há» sans serif. Font nÃ&nbsp;y hiá»ƒn thá»‹ trÃªn mÃ&nbsp;n hÃ¬nh khÃ¡ rÃµ rÃ&nbsp;ng nÃªn nÃ³ thÃ­ch há»£p cho viá»‡c táº¡o cÃ¡c slide trÃ¬nh chiáº¿u. Tuy nhiÃªn nÃ³  khÃ´ng phÃ¹ há»£p vá»›i font toÃ¡n. Sli\TeX{} sans serif Ä‘Æ°á»£c láº¥y lÃ&nbsp;m font vÄƒn báº£n sá»­ dá»¥ng \texttt{tpslifonts.sty}~\cite{texpower}  cá»§a  \TeX{}Power.%

\begin{figure*}
\captiontitle[Computer Modern]{\label{fig:CM}Computer Modern (sá»­ dá»¥ng font Type~1 cá»§a Blue Sky vÃ&nbsp; Y\&amp;Y Type~1; khÃ´ng cáº§n khai bÃ¡o báº¥t ká»³ gÃ³i phá»¥ trá»£ nÃ&nbsp;o).}

\pic{vidupdf/cm.pdf}
\end{figure*}
 


\paragraph{ Font Computer Modern Bright: }

ÄÃ¢y lÃ&nbsp; má»™t font sans serif mÃ&nbsp; Walter A. Schmidt \cite{CTANcmbright} Ä‘Ã£ thÃªm vÃ&nbsp;o  font toÃ¡n tÆ°Æ¡ng á»©ng láº¥y tá»«  Computer Modern. CM-Super bao gá»“m cÃ¡c phiÃªn báº£n Type~1  cá»§a font vÄƒn báº£n thuáº§n dÃ¹ng báº£ng mÃ£ T1, Ä‘á»“ng thá»i  Harald Harders Ä‘Ã£ dÃ¹ng \texttt{mftrace}  Ä‘á»ƒ cho ra cÃ¡c phiÃªn báº£n Type~1 cho  font toÃ¡n vÃ&nbsp; font vÄƒn báº£n, gá»i lÃ&nbsp; \texttt{hfbright}~\cite{CTANhfbright}. Hiá»‡n nay Computer Modern Bright chÆ°a Ä‘Æ°á»£c viá»‡t hÃ³a.%


\begin{figure*}
\captiontitle[CM Bright]{\label{fig:CMBright}CM Bright (\texttt{\textbackslash{}usepackage\{cmbright\}};
Ä‘áº§u ra dÃ¹ng cÃ¡c font \texttt{hfbright}).}

\pic{vidupdf/cmbright.pdf}
\end{figure*}



\paragraph{CÃ¡c font Concrete vÃ&nbsp; Euler hay Concrete Math:}

Knuth Ä‘Ã£ táº¡o ra font Concrete Ä‘á»ƒ dÃ¹ng cho cuá»‘n sÃ¡ch cá»§a Ã´ng mang tÃªn \emph{Concrete
Mathematics}~\cite{concretebook}. AMS Ä‘Ã£ giao cho Hermann Zapf  thiáº¿t káº¿  font toÃ¡n Euler Ä‘á»ƒ dÃ¹ng cho  sÃ¡ch \emph{Concrete Mathematics}. Trong bá»™ sÆ°u táº­p CM-Super~\cite{CTANcm-super}  cÃ³ cÃ¡c font Type~1 cá»§a Concrete sá»­ dá»¥ng báº£ng mÃ£ T1; vÃ&nbsp; cÃ¡c font Type~1 cá»§a Euler  cÃ³ trong bá»™ tuyá»ƒn táº­p Blue Sky láº¥y tá»« bá»™ sÆ°u táº­p  AMS~\cite{CTANbluesky} vÃ&nbsp; BaKoMa~\cite{CTANbakoma}. GÃ³i \texttt{eulervm} cá»§a Walter Schmidt~\cite{CTANeulervm,eulervm} dÃ¹ng cÃ¡c font áº£o cho font Euler ráº¥t thÃ­ch há»£p Ä‘á»ƒ dÃ¹ng vá»›i \LaTeX{}. Ulrik Vieth Ä‘Ã£ táº¡o ra cÃ¡c font Concrete Math~\cite{CTANconcmath} há»£p vá»›i  text font cá»§a Concrete, Ä‘Ã¢y lÃ&nbsp; cÃ¡c font miá»…n phÃ­ duy nháº¥t Ä‘Æ°á»£c á»©ng dá»¥ng trong  \MF{}. GÃ³i \texttt{ccfonts} cá»§a Walter Schmidt~\cite{CTANccfonts} Ä‘á»•i text font sang Concrete vÃ&nbsp; thay font toÃ¡n báº±ng Concrete Math náº¿u nhÆ° gÃ³i \texttt{eulervm} khÃ´ng Ä‘Æ°á»£c táº£i vÃ&nbsp;o tÃ&nbsp;i liá»‡u.%

\begin{figure*}
\captiontitle[Concrete and Euler]{\label{fig:ConcEuler}Font Concrete
vÄƒn báº£n vá»›i font Euler toÃ¡n  (\texttt{\textbackslash{}usepackage\{ccfonts,eulervm\}
\textbackslash{}usepackage{[}T1{]}\{fontenc\}}).  NÃªn nhá»› ráº±ng font Concrete khÃ´ng cÃ³ kiá»ƒu in Ä‘áº­m, do Ä‘Ã³ nÃ³ sáº½ Ä‘Æ°á»£c thay báº±ng Computer Modern á»Ÿ nhá»¯ng chá»— cÃ³ in Ä‘áº­m. VÃ&nbsp; vÄƒn báº£n Ä‘áº§u ra  sáº½ khÃ´ng dÃ¹ng dÃ¹ng cÃ¡c font CM-Super Concrete.}

\pic{vidupdf/concrete.pdf}
\end{figure*}
%
\begin{figure*}
\captiontitle[Concrete Math]{\label{fig:ConcMath}Font Concrete
vÄƒn báº£n  vá»›i Concrete toÃ¡n (\texttt{\textbackslash{}usepackage\{ccfonts\} \textbackslash{}usepackage{[}T1{]}\{fontenc\}}). Nhá»› ráº±ng Concrete khÃ´ng cÃ³ kiá»ƒu in Ä‘áº­m nÃªn chá»¯ in Ä‘áº­m sáº½ Ä‘Æ°á»£c thay báº±ng Computer Modern. VÃ&nbsp;  vÄƒn báº£n Ä‘áº§u ra sáº½ khÃ´ng dÃ¹ng font CM-Super Concrete.}

\pic{vidupdf/concmath.pdf}
\end{figure*}



\paragraph{Font Iwona vÃ&nbsp; Kurier:}

J. M. Nowacki~\cite{CTANiwona,CTANkurier} Ä‘Ã£ dÃ¹ng há»‡ MetaType1 Ä‘á»ƒ táº¡o ra font Iwona vÃ&nbsp; Kurier dá»±a trÃªn bá»™ chá»¯ cá»§a nhÃ&nbsp; sáº¯p chá»¯ ngÆ°á»i Ba Lan Ma\l{}gorzata Budyta. Hai font nÃ&nbsp;y cÃ³ kiá»ƒu dÃ¡ng giá»‘ng nhau, ngoáº¡i trá»« Kurier trÃ¡nh Ä‘Æ°á»£c {} cÃ¡c ``váº¿t báº«y má»±c''  báº±ng cÃ¡c khoáº£ng trá»‘ng trong   Ä‘Æ°á»ng nÃ©t cá»§a nÃ³. Hai gÃ³i font nÃ&nbsp;y há»— trá»£ font toÃ¡n ráº¥t toÃ&nbsp;n diá»‡n cho cáº£ \TeX{} vÃ&nbsp; \LaTeX{}. BÃªn cáº¡nh Ä‘Ã³ thÃ¬ 2 gÃ³i font nÃ&nbsp;y cÅ©ng há»— trá»£ Tiáº¿ng Viá»‡t cá»§a chÃºng ta ráº¥t hoÃ&nbsp;n háº£o, khÃ´ng cáº§n  táº¡o cÃ¡c há»— trá»£ cáº§n thiáº¿t cho cÃ¡c gÃ³i nÃ&nbsp;y khi dÃ¹ng Ä‘á»ƒ soáº¡n tháº£o cÃ¡c tÃ&nbsp;i liá»‡u tiáº¿ng Viá»‡t.%

\begin{figure*}
\captiontitle[Iwona]{\label{fig:Iwona}Font Iwona trong vÄƒn báº£n thuáº§n vÃ&nbsp; toÃ¡n (\texttt{\textbackslash{}usepackage{[}math{]}\{iwona\}}).}

\pic{vidupdf/iwona.pdf}
\end{figure*}
%
\begin{figure*}
\captiontitle[Kurier]{\label{fig:Kurier}Font Kurier trong vÄƒn báº£n thuáº§n vÃ&nbsp;  toÃ¡n (\texttt{\textbackslash{}usepackage{[}math{]}\{kurier\}}).}

\pic{vidupdf/kurier.pdf}
\end{figure*}

\paragraph{Font Antykwa P\'o\l{}tawskiego:}

Font  Antykwa P\'o\l{}tawskiego~\cite{CTANantp} cÅ©ng Ä‘Æ°á»£c J. M. Nowacki dÃ¹ng MetaType1 táº¡o ra dá»±a trÃªn bá»™ chá»¯ cá»§a  nhÃ&nbsp; sáº¯p chá»¯ ngÆ°á»i Ba Lan Adam P\'o\l{}tawski. GÃ³i \texttt{antpolt} vÃ&nbsp;o thá»i Ä‘iá»ƒm nÃ&nbsp;y váº«n chÆ°a há»— trá»£ font toÃ¡n vÃ&nbsp; yÃªu cáº§u pháº£i sá»­ dá»¥ng  báº£ng mÃ£ QX hoáº·c OT4. Do váº­y font nÃ&nbsp;y khÃ´ng há»— trá»£ tiáº¿ng Viá»‡t.%

\begin{figure*}
\captiontitle[Antykwa P\'o\l{}tawskiego]{\label{fig:AntPolt} Font Antykwa
P\'o\l{}tawskiego vÄƒn báº£n (\texttt{\textbackslash{}usepackage\{antpolt\}}
vÃ&nbsp; \texttt{\textbackslash{}usepackage{[}QX{]}\{fontenc\}}).}

\pic{vidupdf/antpolt.pdf}
\end{figure*}


\paragraph{Font Antykwa Toru\acuten{}ska:}

Font Antykwa Toru\acuten{}ska cÅ©ng do J. M. Nowacki~\cite{AntTorunska,CTANantt} táº¡o ra báº±ng  MetaType1 dá»±a trÃªn bá»™ chá»¯ cá»§a Zygfryd Gardzielewski. GÃ³i \texttt{anttor} há»— trá»£ hoÃ&nbsp;n toÃ&nbsp;n cho font toÃ¡n trong \TeX{} vÃ&nbsp; \LaTeX{}. Bá»™ font nÃ&nbsp;y cÅ©ng há»— trá»£ tiáº¿ng Viá»‡t ráº¥t hoÃ&nbsp;n chá»‰nh.

\begin{figure*}
\captiontitle[Antykwa Toru\'nska]{\label{fig:AntTor}Font Antykwa Toru\acuten{}ska
trong vÄƒn báº£n thuáº§n vÃ&nbsp; toÃ¡n (\texttt{\textbackslash{}usepackage{[}math{]}\{anttor\}}).}

\pic{vidupdf/anttor.pdf}
\end{figure*}



\section{\label{sec:PSFonts}CÃ¡c font Postscript cÆ¡ sá»Ÿ}

Khi Adope giá»›i thiá»‡u Postscript vÃ&nbsp;o nÄƒm 1984 thÃ¬ há» Ä‘Ã£ Ä‘á»‹nh nghÄ©a 35 font cÆ¡ sá»Ÿ (cÃ¡c font nÃ&nbsp;y náº±m trong 10 bá»™ chá»¯), chÃºng cÃ³ máº·t háº§u háº¿t trong táº¥t cáº£  cÃ¡c bá»™ chuyá»ƒn Ä‘á»•i Postscript. VÃ&nbsp;o nÄƒm 1996 URW++ Ä‘Ã£ cÃ´ng bá»‘ má»™t bá»™ font thay tháº¿ cho cÃ¡c font cÆ¡ sá»Ÿ theo giáº¥y phÃ©p cá»§a  GNU General Public License.  Ban Ä‘áº§u  cÃ¡c font URW++ Ä‘Æ°á»£c cung cáº¥p Ä‘á»ƒ dÃ¹ng vá»›i Ghostscript, lÃ&nbsp; má»™t bá»™ bá»™ chuyá»ƒn Ä‘á»•i Postscript miá»…n phÃ­. CÃ¡c font Postscript gá»‘c Ä‘Æ°á»£c liá»‡t kÃª Ä‘áº§y Ä‘á»§ trong báº£ng~\ref{cap:CorePostscriptFonts} cÃ¹ng vá»›i URW++/Ghostscript. Má»—i font cÃ³ thá»ƒ  dÃ¹ng lÃ&nbsp;m font  máº·c Ä‘á»‹nh cho vÄƒn báº£n báº±ng viá»‡c chá»n dÃ¹ng cÃ¡c gÃ³i  cá»§a \LaTeX{} láº¥y tá»« báº£n phÃ¢n phá»‘i  cá»§a PSNFSS\footnote{TÃ&nbsp;i liá»‡u tiáº¿ng Viá»‡t vá» PSNFSS  cÃ³  táº¡i trang chá»§ cá»§a \htmladdnormallink{Vn\TeX{}}{http://vntex.org/} }~\cite{CTANpsnfss}.

% 35 font Postscript Ä‘Ã£ Ä‘Æ°á»£c HÃ&nbsp;n Tháº¿ ThÃ&nbsp;nh dÃ&nbsp;y cÃ´ng viá»‡t hÃ³a vÃ&nbsp; Ä‘Ã³ng thÃ&nbsp;nh gÃ³i %URWVN, báº¡n cÃ³ thá»ƒ sá»­ dá»¥ng chÃºng vá»›i Vn\TeX{}, bÃªn cáº¡nh Ä‘Ã³ tÃ&nbsp;i liá»‡u tiáº¿ng Viá»‡t %vá» PSNFSS  cÃ³  táº¡i trang chá»§ cá»§a \htmladdnormallink{Vn\TeX{}}{http://vntex.org/}.%


\begin{table}
\begin{center}\begin{tabular}{|cccc|}
\hline 
Adobe Postscript&amp;
URW++/Ghostscript&amp;
\# cá»§a cÃ¡c font&amp;
gÃ³i\tabularnewline
\hline
Avant Garde&amp;
URW Gothic L&amp;
4&amp;
\texttt{avant}\tabularnewline
Bookman&amp;
URW Bookman L&amp;
4&amp;
\texttt{bookman}\tabularnewline
Courier&amp;
Nimbus Mono L&amp;
4&amp;
\texttt{courier}\tabularnewline
Helvetica&amp;
Nimbus Sans L&amp;
8&amp;
\texttt{helvet}\tabularnewline
New Century Schoolbook&amp;
Century Schoolbook L&amp;
4&amp;
\texttt{newcent}\tabularnewline
Palatino&amp;
URW Palladio L&amp;
4&amp;
\texttt{palatino}\tabularnewline
Symbol&amp;
Standard Symbols L&amp;
1&amp;
---\tabularnewline
Times&amp;
Nimbus Roman No.\ 9 L&amp;
4&amp;
\texttt{times}\tabularnewline
Zapf Chancery&amp;
URW Chancery L&amp;
1&amp;
\texttt{chancery}\tabularnewline
Zapf Dingbats&amp;
Dingbats&amp;
1&amp;
---\tabularnewline
\hline
\end{tabular}\end{center}

\begin{center}\captiontitle[Core Postscript fonts]{\label{cap:CorePostscriptFonts}CÃ¡c font
Postscript  cÆ¡ sá»Ÿ cÃ¹ng vá»›i  URW++/Ghostscript tÆ°Æ¡ng á»©ng.}\end{center}
\end{table}
 


\paragraph{Font Avant Garde vÃ&nbsp; Kerkis Sans:}

Antonis Tsolomitis~\cite{Kerkis,CTANkerkis} Ä‘Ã£ má»Ÿ rá»™ng  font Avant Garde thÃ&nbsp;nh Kerkis Sans cÃ³ thÃªm vÃ&nbsp;o cÃ¡c kÃ½ tá»± Latin vÃ&nbsp; Hy láº¡p. Font Kerlis Sans lÃ&nbsp; má»™t bá»™ font biá»‡t láº­p vÃ&nbsp; cÃ³ thá»ƒ dÃ¹ng nÃ³ vá»›i cÃ¡c á»©ng dá»¥ng khÃ¡c ngoÃ&nbsp;i \TeX{}. GÃ³i \texttt{kerkis} biáº¿n  font sans serif thÃ&nbsp;nh Kerkis Sans, tuy nhiÃªn khÃ´ng cÃ³ tÃ¹y chá»n nÃ&nbsp;o cá»§a  cÃ¡c gÃ³i lá»‡nh Ä‘á»ƒ máº·c Ä‘á»‹nh font nÃ&nbsp;y lÃ&nbsp;m text font  cho thÃ¢n tÃ&nbsp;i liá»‡u.



\paragraph{Font Bookman vÃ&nbsp; Kerkis:}

Antonis Tsolomitis~\cite{Kerkis,CTANkerkis} cÅ©ng Ä‘Ã£ má»Ÿ rá»™ng font URW Bookman~L thÃ&nbsp;nh font Kerkis cÃ³ thÃªm vÃ&nbsp;o má»™t sá»‘ kÃ½ tá»± Latin vÃ&nbsp; Hy Láº¡p. Káº¿t quáº£ lÃ&nbsp; Ä‘Ã£ táº¡o ra má»™t bá»™ font biá»‡t láº­p cÃ³ thá»ƒ dÃ¹ng chung vá»›i cÃ¡c á»©ng dá»¥ng khÃ¡c ngoÃ&nbsp;i \TeX{}. Font kÃ½ hiá»‡u toÃ¡n cÅ©ng Ä‘Æ°á»£c thÃªm vÃ&nbsp;o nhÆ°ng \LaTeX{}  khÃ´ng dÃ¹ng Ä‘áº¿n nÃ³, gÃ³i  \texttt{kmath} dÃ¹ng cÃ¡c txfont cho cÃ¡c kÃ½ hiá»‡u toÃ¡n vÃ&nbsp; cÃ¡c chá»¯ cÃ¡i Hy Láº¡p kiá»ƒu in hoa.%

\begin{figure*}
\captiontitle[Kerkis]{\label{fig:Kerkis}Kerkis trong vÄƒn báº£n vÃ&nbsp; cÃ´ng thá»©c toÃ¡n (\texttt{\textbackslash{}usepackage\{kmath,kerkis\}};
thá»© tá»± cá»§a cÃ¡c gÃ³i khÃ´ng cÃ²n quan trá»ng ná»¯a khi  \texttt{kmath} táº£i gÃ³i
\texttt{txfonts}  Ä‘á»ƒ thay Ä‘á»•i font máº·c Ä‘á»‹nh cá»§a tÃ&nbsp;i liá»‡u).}

\pic{vidupdf/kerkis.pdf}
\end{figure*}



\paragraph{Font New Century Schoolbook vÃ&nbsp; Millennial hay fouriernc: }

Font toÃ¡n Millennial cá»§a Stephen G. Hartke cÃ³  há»— trá»£ thÃªm cÃ¡c kÃ½ tá»± Hy Láº¡p vÃ&nbsp; cÃ¡c kÃ½ tá»± khÃ¡c giá»‘ng kÃ½ hiá»‡u toÃ¡n há»c. Má»™t bá»™ font áº£o dÃ¹ng font New Century Schoolbook cho cÃ¡c máº«u tá»± Latin trong toÃ¡n, dÃ¹ng font  Millennial cho cÃ¡c chá»¯ cÃ¡i Hy Láº¡p, cÃ¡c chá»¯ cÃ¡i trÃ´ng giá»‘ng kÃ½ hiá»‡u, txfont, dÃ¹ng Computer Modern  cho cÃ¡c kÃ½ hiá»‡u khÃ¡c, bao gá»“m cáº£ cÃ¡c toÃ¡n tá»­ 2 ngÃ´i, kÃ½ hiá»‡u quan há»‡ vÃ&nbsp; cÃ¡c kÃ½ hiá»‡u cÃ³ kÃ­ch cá»¡ lá»›n. Bá»™ font nÃ&nbsp;y Ä‘ang trong giai Ä‘oáº¡n Ä‘Æ°á»£c hoÃ&nbsp;n thiá»‡n vÃ&nbsp; hy vá»ng lÃ&nbsp; sáº½ ká»‹p cÃ´ng bá»‘ trong nÄƒm 2006. GÃ³i \texttt{fouriernc} cá»§a Michael Zedler~\cite{CTANfouriernc} dÃ¹ng font New Century Schoolbook cho thÃ¢n tÃ&nbsp;i liá»‡u vÃ&nbsp; cho cÃ¡c chá»¯ cÃ¡i Hy Láº¡p trong cÃ´ng thá»©c toÃ¡n, dÃ¹ng font kÃ½ hiá»‡u cá»§a gÃ³i Fourier-GUTenberg Ä‘á»ƒ duy trÃ¬ cÃ¡c kÃ½ hiá»‡u toÃ¡n há»c cho tÃ&nbsp;i liá»‡u.%


\begin{figure*}
\captiontitle[Millennial]{\label{fig:Millen} Font New Century Schoolbook cÃ¹ng vá»›i font toÃ¡n Millennial \captionbreak (\texttt{\textbackslash{}usepackage\{millennial\}}).}

\pic{vidupdf/millennial}
\end{figure*}
%
\begin{figure*}
\captiontitle[fouriernc]{\label{fig:fouriernc}New Century Schoolbook 
cÃ¹ng vá»›i font Fourier toÃ¡n  \captionbreak (\texttt{\textbackslash{}usepackage\{fouriernc\}}).}

\pic{vidupdf/fouriernc.pdf}
\end{figure*}



\paragraph{Palatino vÃ&nbsp; pxfonts, Pazo, hay mathpple:}

Young Ryu Ä‘Ã£ táº¡o ra bá»™ tuyá»ƒn táº­p pxfonts~\cite{CTANpxfonts} cÃ³ thÃªm cÃ¡c chá»¯ cÃ¡i Hy Láº¡p vÃ&nbsp; má»™t sá»‘ chá»¯ cÃ¡i cÃ³ bá»™ máº·t tÆ°Æ¡ng tá»± cÃ¡c kÃ½ hiá»‡u, cá»™ng thÃªm cÃ¡c kÃ½ hiá»‡u hÃ¬nh há»c vÃ&nbsp; cÃ¡c kÃ½ hiá»‡u cÃ³ trong gÃ³i AMS. Diego Puga Ä‘Ã£ táº¡o ra font Pazo toÃ¡n bao gá»“m cÃ¡c chá»¯ cÃ¡i Hy Láº¡p vÃ&nbsp; cÃ¡c máº«u tá»± khÃ¡c trÃ´ng giá»‘ng kÃ½ hiá»‡u cÃ³ kiá»ƒu há»£p vá»›i Palatino. GÃ³i \texttt{mathpazo}\footnote{GÃ³i nÃ&nbsp;y cÃ³ trong báº£n phÃ¢n phá»‘i cá»§a PSNFSS~\cite{CTANpsnfss} } dÃ¹ng font Palatino cho cÃ¡c chá»¯ cÃ¡i Latin vÃ&nbsp; font Euler kiá»ƒu hÆ¡i nghiÃªng cho cÃ¡c chá»¯ cÃ¡i Hy Láº¡p vÃ&nbsp; cÃ¡c kÃ½ hiá»‡u khÃ¡c. Ká»ƒ tá»« khi mÃ&nbsp; Hermann Zapf thiáº¿t káº¿ ra Palatino vÃ&nbsp; Euler, thÃ¬ chÃºng ráº¥t Äƒn khá»›p vá»›i nhau. Má»™t chá»n lá»±a khÃ¡c Ä‘á»ƒ dÃ¹ng font Euler lÃ&nbsp; sá»­ dá»¥ng gÃ³i \texttt{eulervm}. Bá»‡n cáº¡nh Ä‘Ã³ Ralf Stubner Ä‘Ã£ thÃªm cÃ¡c small cap vÃ&nbsp; chá»¯ sá»‘ kiá»ƒu cá»• Ä‘iá»ƒn vÃ&nbsp;o URW Palladio L trong gÃ³i FPL~\cite{CTANfpl}, Walter Schmidt Ä‘Ã£ má»Ÿ rá»™ng thÃªm cÃ¡c font nÃ&nbsp;y trong gÃ³i FPL Neu~\cite{fplneu}.%

\begin{figure*}
\captiontitle[pxfonts]{\label{fig:pxfonts}Font Palatino trong vÄƒn báº£n cÃ¹ng vá»›i pxfonts toÃ¡n 
 (\texttt{\textbackslash{}usepackage\{pxfonts\}}).}

\pic{vidupdf/pxfonts.pdf}
\end{figure*}
%
\begin{figure*}
\captiontitle[Pazo]{\label{fig:Pazo}Font Palatino trong vÄƒn báº£n cÃ¹ng vá»›i font toÃ¡n Pazo
(\texttt{\textbackslash{}usepackage\{mathpazo\}}).}

\pic{vidupdf/pazo.pdf}
\end{figure*}
%
\begin{figure*}
\captiontitle[mathpple]{\label{fig:mathpple}Font Palatino trong vÄƒn báº£n cÃ¹ng vá»›i font toÃ¡n Euler (\texttt{\textbackslash{}usepackage\{mathpple\}}).}

\pic{vidupdf/mathpple.pdf}
\end{figure*}



\paragraph{Font Times vÃ&nbsp; cÃ¡c   txfonts, Belleek, mathptmx, hay  mbtimes:}

 CÅ©ng láº¡i lÃ&nbsp; Young Ryu tÃ¡c giáº£ cá»§a bá»™ pxfont Ä‘Ã£ táº¡o ra bá»™  tuyá»ƒn táº­p  txfonts~\cite{CTANtxfonts}  cÃ³  cÃ¡c chá»¯ cÃ¡i Hy Láº¡p vÃ&nbsp; cÃ¡c chá»¯ cÃ¡i khÃ¡c trÃ´ng giá»‘ng dáº¡ng kÃ½ hiá»‡u vÃ&nbsp; cÃ³ thÃªm má»™t bá»™ kÃ½ hiá»‡u hÃ¬nh há»c hoÃ&nbsp;n chá»‰nh cÃ¹ng vá»›i cÃ¡c kÃ½ hiá»‡u náº±m trong gÃ³i AMS. NgoÃ&nbsp;i ra gÃ³i \texttt{txfonts}  cÃ²n bao gá»“m font Ä‘Ã¡nh mÃ¡y kiá»ƒu cá»• Ä‘iá»ƒn,  font \texttt{txtt}. Font Belleek do Richard Kinch~\cite{CTANbelleek,Belleek} táº¡o ra Ä‘á»ƒ thay tháº¿ cho cÃ¡c font thÆ°Æ¡ng máº¡i mÃ&nbsp; gÃ³i \texttt{mathtime}\footnote{Font nÃ&nbsp;y cÃ³ trong bá»™ tuyá»ƒn táº­p PSNFSS~\cite{CTANpsnfss}} cáº§n dÃ¹ng Ä‘áº¿n.  GÃ³i \texttt{mathptmx}\footnote{Font nÃ&nbsp;y cÃ³ trong bá»™ tuyá»ƒn táº­p PSNFSS~\cite{CTANpsnfss} vÃ&nbsp; hiá»‡n nay nÃ³ Ä‘Ã£ há»— trá»£ tiáº¿ng Viá»‡t.}   dÃ¹ng Times cho cÃ¡c chá»¯ cÃ¡i Latin, dÃ¹ng cÃ¡c kÃ½ hiá»‡u lÃ&nbsp;m chá»¯ cÃ¡i Hy Láº¡p  vÃ&nbsp; cÃ¡c kÃ½ hiá»‡u khÃ¡c. Michel Bovani Ä‘Ã£ táº¡o ra gÃ³i \texttt{mbtimes}  báº±ng cÃ¡c sá»­ dá»¥ng font Omega Serif cho vÄƒn báº£n, cÃ¡c chá»¯ cÃ¡i Latin, cÃ¡c chá»¯ cÃ¡i Hy Láº¡p cho toÃ¡n. BÃªn cáº¡nh Ä‘Ã³ gÃ³i \texttt{mbtimes} cÃ³ thÃªm cÃ¡c font kÃ½ hiá»‡u vÃ&nbsp; má»™t bá»™ chá»¯ kiá»ƒu hoa má»¹.  Omega Serif lÃ&nbsp; font cÆ¡ sá»Ÿ cho Omega, má»™t há»‡ \TeX{} 16-bit má»Ÿ rá»™ng cá»§a John Plaice \&amp;{}  Yannis Haralambous~\cite{Omega}.
 
 Dá»± Ã¡n font STIX~\cite{STIX} lÃ&nbsp; káº¿t quáº£ há»£p tÃ¡c cá»§a nhiá»u nhÃ&nbsp; xuáº¥t báº£n nháº±m táº¡o ra  má»™t bá»™ font  Times tÃ­ch há»£p chá»©a cÃ¡c dáº¥u cáº§n thiáº¿t cho viá»‡c xuáº¥t báº£n cÃ¡c tÃ&nbsp;i liá»‡u toÃ¡n vÃ&nbsp; kÄ© thuáº­t. CÃ¡c font nÃ&nbsp;y Ä‘ang trong giai Ä‘oáº¡n Ä‘Æ°á»£c phÃ¡t triá»ƒn vá»›i dá»± Ä‘á»‹nh  sáº½ cÃ´ng bá»‘ káº¿t quáº£ nghiÃªn cá»©u vÃ&nbsp;o giá»¯a nÄƒm 2006.

 LÆ°u Ã½ ráº±ng náº¿u Times khÃ´ng Ä‘Æ°á»£c nhÃºng vÃ&nbsp;o file tÃ&nbsp;i liá»‡u PDF thÃ¬ Adobe Reader 7.0 sáº½ thay nÃ³ báº±ng Adobe Serif MM, vÃ&nbsp; Ghostscript sáº½ thay Times báº±ng Nimbus Roman No.\ 9 L tÆ°Æ¡ng Ä‘Æ°Æ¡ng. TÃ´i cÅ©ng cÃ³ nghe nÃ³i ráº±ng cÃ¡c phiÃªn báº£n cá»§a Adobe Reader trÃªn Windows sáº½  hiá»ƒn thá»‹ Times 
New Roman náº¿u Times khÃ´ng Ä‘Æ°á»£c nhÃºng vÃ&nbsp;o file tÃ&nbsp;i liá»‡u, chá»© tÃ´i váº«n chÆ°a thá»­. Kiá»ƒu tháº³ng Ä‘á»©ng cá»§a hai bá»™ nÃ&nbsp;y tÆ°Æ¡ng Ä‘á»‘i giá»‘ng nhau, nhÆ°ng kiá»ƒu italics thÃ¬ khÃ¡c nhau xa (xem xÃ©t vÃ­ dá»¥  Ã¡p dá»¥ng 2 font nÃ&nbsp;y lÃªn chá»¯ \emph{z} sáº½ rÃµ).%


\begin{figure*}
\captiontitle[txfonts]{\label{fig:txfonts}Times trong vÄƒn báº£n  cÃ¹ng vá»›i  txfonts 
toÃ¡n (\texttt{\textbackslash{}usepackage{[}varg{]}\{txfonts\}}).}

\pic{vidupdf/txfonts.pdf}
\end{figure*}
%
\begin{figure*}
\captiontitle[Belleek]{\label{fig:Belleek}Times trong vÄƒn báº£n  cÃ¹ng vá»›i Belleek 
toÃ¡n (\texttt{\textbackslash{}usepackage\{mathtime\}}; Ä‘áº§u ra sá»­ dá»¥ng 
font  Belleek).}

\pic{vidupdf/belleek}
\end{figure*}
%
\begin{figure*}
\captiontitle[mathptmx]{\label{fig:mathptmx}Times trong vÄƒn báº£n  cÃ¹ng vá»›i cÃ¡c kÃ½ hiá»‡u toÃ¡n (\texttt{\textbackslash{}usepackage\{mathptmx\}}).}

\pic{vidupdf/mathptmx.pdf}
\end{figure*}
%
\begin{figure*}
\captiontitle[mbtimes]{\label{fig:mbtimes}Omega Serif trong vÄƒn báº£n cÃ¹ng vá»›i 
Omega toÃ¡n (\texttt{\textbackslash{}usepackage\{mbtimes\}}).}

\pic{vidupdf/mbtimes}
\end{figure*}


\bigskip{}
 CÃ¡c font nhÆ° Helvetica, Courier, vÃ&nbsp; Zapf Chancery  thÃ¬ khÃ´ng cÃ³ cÃ¡c font toÃ¡n tÆ°Æ¡ng á»©ng, dÃ¹ sao thÃ¬  cÃ¡c font Courier vÃ&nbsp; Zapf Chancery cÅ©ng khÃ´ng phÃ¹ há»£p Ä‘á»ƒ  soáº¡n tháº£o cÃ¡c cÃ´ng thá»©c toÃ¡n. nhÆ°ng Helvetica thá»‰nh thoáº£ng Ä‘Æ°á»£c nhÃºng vÃ&nbsp;o cÃ¡c slide trÃ¬nh chiáº¿u vÃ&nbsp; cÃ¡c  Ã¡p phÃ­ch. CÃ¡c font miá»…n phÃ­ nhÆ° MgOpenModerna~\cite{MgOpenModerna} vÃ&nbsp; FreeSans~\cite{FreeSans}  cÃ³ thá»ƒ trá»Ÿ thÃ&nbsp;nh má»™t chá»n lá»±a khÃ´n ngoan cho cÃ¡c chá»¯ cÃ¡i Hy Láº¡p  Ä‘á»ƒ dÃ¹ng trong má»™t tÃ&nbsp;i liá»‡u  sá»­ dá»¥ng font Helvetica lÃ&nbsp;m font toÃ¡n.

 
\section{\label{sec:OtherFonts}CÃ¡c bá»™ font miá»…n phÃ­ khÃ¡c}

Hiá»‡n nay  ngÆ°á»i ta cung cáº¥p ráº¥t nhiá»u font Ä‘á»ƒ dÃ¹ng chung vá»›i cÃ¡c pháº§n má»m mÃ£ nguá»“n má»Ÿ, vÃ&nbsp; cÃ³ nhiá»u gÃ³i lá»‡nh \LaTeX{} Ä‘Ã£ Ä‘Æ°á»£c táº¡o ra Ä‘á»ƒ giÃºp báº¡n cÃ³ thá»ƒ sá»­ dá»¥ng nhá»¯ng font nÃ&nbsp;y.



\paragraph{Bitstream Vera Sans vÃ&nbsp; Arev Sans:}

Bistream Vera  lÃ&nbsp;  sáº£n pháº©m há»£p tÃ¡c cá»§a Bitstream vÃ&nbsp; Gnome
Foundation~\cite{vera} nháº±m cung cáº¥p má»™t bá»™ font miá»…n phÃ­ cÃ³ cháº¥t lÆ°á»£ng cao cho cÃ¡c pháº§n má»m mÃ£ nguá»“n má»Ÿ.  Vera serif, sans serif, vÃ&nbsp; sans mono cÃ³ thá»ƒ nhÃºng Ä‘Æ°á»£c vÃ&nbsp;o vÄƒn báº£n báº±ng  cÃ¡ch sá»­ dá»¥ng gÃ³i \texttt{bera} cá»§a Malte Rosenau vÃ&nbsp; Walter~A. Schmidt~\cite{CTANbera}. Tavmjong
Bah Ä‘Ã£ thÃªm cÃ¡c  máº«u tá»± Hy Láº¡p, Xirin (Cyrillic) vÃ&nbsp;  kÃ½ hiá»‡u toÃ¡n há»c Ä‘á»ƒ má»Ÿ rá»™ng Bitstream Vera Sans thÃ&nbsp;nh Arev Sans~\cite{arev}. TÃ¡c giáº£ cá»§a bÃ&nbsp;i viáº¿t nÃ&nbsp;y cÅ©ng  Ä‘Ã£ táº¡o ra  gÃ³i   \texttt{arev}~\cite{CTANarev} há»— trá»£ \LaTeX{} dÃ¹ng Arev Sans cho vÄƒn báº£n, kÃ½ hiá»‡u toÃ¡n vÃ&nbsp; dÃ¹ng cÃ¡c font Math Design cho Bitstream Charter dÃ¹ng lÃ&nbsp;m kÃ½ hiá»‡u.%

\begin{figure*}
\captiontitle[Arev Sans]{\label{fig:Arev}Arev Sans trong vÄƒn báº£n  vÃ&nbsp;  Arev 
toÃ¡n (\texttt{\textbackslash{}usepackage\{arev\}}).}

\pic{vidupdf/arev.pdf}
\end{figure*}



\paragraph{Bitstream Charter vÃ&nbsp; Math Design:}

Bistream Ä‘Ã£ cung cáº¥p miá»…n phÃ­ bá»™  font Bitstream Charter~\cite{CTANcharter} Ä‘á»ƒ dÃ¹ng trong cÃ¡c há»‡ Ä‘iá»u hÃ&nbsp;nh X Windows. Paul Pichaureau~\cite{CTANmathdesign} Ä‘Ã£ thiáº¿t káº¿  hoÃ&nbsp;n chá»‰nh cÃ¡c font  Math Design cho Bitstream Charter bao gá»“m cÃ¡c máº«u tá»± Hy Láº¡p, cÃ¡c kÃ½ hiá»‡u láº¥y tá»«  Computer Modern vÃ&nbsp; AMS. Font Charis SIL\footnote{LÃª BÃ¡ Phi  Ä‘Ã£ táº¡o gÃ³i há»— trá»£ Ä‘á»ƒ  cÃ³ thá»ƒ dÃ¹ng font nÃ&nbsp;y vÃ&nbsp;o cÃ¡c tÃ&nbsp;i liá»‡u Tiáº¿ng Viá»‡t, tuy nhiÃªn cÃ¡c dáº¥u mÃ³c cho chá»¯ Æ¯ vÃ&nbsp; chá»¯ Æ&nbsp; chÆ°a Ä‘Æ°á»£c Ä‘áº¹p cho láº¯m. Má»™t tin Ä‘Ã¡ng buá»“n lÃ&nbsp; tháº§y LÃª BÃ¡ Phi Ä‘Ã£ qua Ä‘á»i vÃ&nbsp;o ngÃ&nbsp;y 03 thÃ¡ng 7 nÄƒm 2006}~\cite{CharisSIL} cÃ³ thá»ƒ  lÃ&nbsp;  lá»±a chá»n Ä‘Ã¡ng chÃº Ã½ cho viá»‡c dÃ¹ng cÃ¡c chá»¯ cÃ¡i Hy Láº¡p Ä‘á»ƒ  Äƒn khá»›p vá»›i Bitstream Charter tá»‘t hÆ¡n. Má»™t giáº£i phÃ¡p khÃ¡c cho font toÃ¡n lÃ&nbsp; dÃ¹ng font Euler chung vá»›i cÃ¡c gÃ³i \texttt{charter}
vÃ&nbsp; \texttt{eulervm}.%


\begin{figure*}
\captiontitle[ Font Math Design cho Charter]{\label{fig:chartermd}Bitstream
Charter trong vÄƒn báº£n cÃ¹ng vá»›i  Math Design \captionbreak (\texttt{\textbackslash{}usepackage{[}charter{]}\{mathdesign\}}).}

\pic{vidupdf/chartermd.pdf}
\end{figure*}



\paragraph{Comic Sans:}

Comic Sans~\cite{comicsans} lÃ&nbsp; má»™t trong nhá»¯ng font miá»…n phÃ­ dÃ¹ng  cho web  mÃ&nbsp; Microsoft cung cáº¥p. GÃ³i \texttt{comicsans} cá»§a Scott Pakin~\cite{CTANcomicsans}   sá»­ dá»¥ng font Comic Sans cho  vÄƒn báº£n vÃ&nbsp; cÃ¡c chá»¯ cÃ¡i HyLáº¡p, Latin trong cÃ¡c tÃ&nbsp;i liá»‡u toÃ¡n há»c. CÃ¡c kÃ½ hiá»‡u hÃ¬nh há»c trong Computer Modern khÃ´ng cÃ³ máº·t trong Comic Sans. Äá»‘i vá»›i cÃ¡c Ä‘oáº¡n vÄƒn cÃ³ Ä‘á»™ dÃ&nbsp;i tÆ°Æ¡ng Ä‘á»‘i thÃ¬ khi dÃ¹ng font Comic Sans lÃ&nbsp;m cho ngÆ°á»i Ä‘á»c tháº¥y rá»‘i máº¯t nhÆ°ng font nÃ&nbsp;y cÃ³ láº½ thÃ­ch há»£p cho cÃ¡c  Ä‘oáº¡n chÃº thÃ­ch ngáº¯n theo kiá»ƒu viáº¿t tay.%

\begin{figure*}
\captiontitle[Comic Sans]{\label{fig:comicsans}Comic Sans trong vÄƒn báº£n vÃ&nbsp; trong toÃ¡n
 (\texttt{\textbackslash{}usepackage\{comicsans\}}).}

\pic{vidupdf/comicsans}
\end{figure*}


\begin{comment}
 GÃ³i Gentium váº«n Ä‘ang Ä‘Æ°á»£c phÃ¡t triá»ƒn vÃ&nbsp; chÆ°a Ä‘Æ°á»£c cÃ´ng bá»‘.

\paragraph{Gentium: }

 Gentinum do Victor Gaultney~\cite{Gentium} thiáº¿t káº¿, bá»™ font nÃ&nbsp;y thÃ­ch há»£p cho cÃ¡c ngÃ´n ngá»¯ gá»‘c Latin. Bá»™ Gentinum Ä‘Æ°á»£c SIL cung cáº¥p theo giáº¥y phÃ©p cá»§a  Open Font License. Michael Zedler Ä‘Ã£ chuyá»ƒn Gentinum sang Type~1 vÃ&nbsp; Ä‘Ã£ táº¡o ra gÃ³i \LaTeX{}  há»— trá»£ cho bá»™ font nÃ&nbsp;y~\cite{Gentiumtex}%
 \footnote{ GÃ³i nÃ&nbsp;y hiá»‡n nay Ä‘ang Ä‘Æ°á»£c phÃ¡t triá»ƒn, khi hoÃ&nbsp;n táº¥t cháº¯c cÃ³ láº½ sáº½ Ä‘Æ°á»£c cÃ´ng bá»‘ chÃ­nh thá»©c
}%
 Trong cÃ¡c cÃ´ng thá»©c toÃ¡n thÃ¬ Gentinum Ä‘Æ°á»£c dÃ¹ng cho cÃ¡c chá»¯ cÃ¡i Hy Láº¡p, Latin vÃ&nbsp; dÃ¹ng MnSymbol cho cÃ¡c kÃ½ hiá»‡u hÃ¬nh há»c.%

\begin{figure*}
\captiontitle[Gentium]{\label{fig:Gentium}Gentium trong vÄƒn báº£n káº¿t há»£p vá»›i Gentium toÃ¡n
 (\texttt{\textbackslash{}usepackage\{gentium\}}).}

\pic{vidupdf/gentium.pdf}
\end{figure*}


\end{comment}

\paragraph{URW Garamond vÃ&nbsp; Math Design: }

URW Garamond No.~8~\cite{CTANgaramond} náº±m trong dá»± Ã¡n GhostPCL, Ä‘Æ°á»£c cung cáº¥p theo cÃ¡c Ä‘iá»u khoáº£n cá»§a Aladdin Free Public License. Paul Pichaureau~\cite{CTANmathdesign} Ä‘Ã£ táº¡o ra cÃ¡c font Math Design dÃ¹ng cho URW Garamond lÃ&nbsp; ráº¥t hoÃ&nbsp;n chá»‰nh, bao gá»“m cÃ¡c chá»¯ cÃ¡i Hy Láº¡p, cÃ¡c kÃ½ hiá»‡u láº¥y tá»«  Computer Modern vÃ&nbsp;  AMS.

\begin{figure*}
\captiontitle[Math Design trong Garamond]{\label{fig:garamd}URW Garamond
trong vÄƒn báº£n cÃ¹ng vá»›i Math Design toÃ¡n \captionbreak (\texttt{\textbackslash{}usepackage{[}garamond{]}\{mathdesign\}}).}

\pic{vidupdf/garamondmd}
\end{figure*}



\paragraph{Utopia vÃ&nbsp; Fourier hoáº·c lÃ&nbsp; Math Design:}

Adobe Ä‘Ã£ cung cáº¥p Utopia~\cite{CTANutopia} Ä‘á»ƒ dÃ¹ng vá»›i  há»‡ X Windows. VÃ&nbsp; Michel Bovani cÅ©ng Ä‘Ã£ táº¡o ra Fourier-GUTenberg~\cite{CTANfourier} cÃ³ chá»©a cÃ¡c kÃ½ tá»± chuáº©n vÃ&nbsp; cÃ¡c chá»¯ cÃ¡i Hy Láº¡p ngoÃ&nbsp;i ra cÃ²n cÃ³ thÃªm cÃ¡c kÃ½ hiá»‡u láº¥y tá»« AMS, bá»• sung ráº¥t hoÃ&nbsp;n háº£o cho Utopia. Bá»™ Math design Ä‘Æ°á»£c Paul Pichaureau~\cite{CTANmathdesign} thiáº¿t káº¿ Ä‘á»ƒ dÃ¹ng vá»›i  Utopia cÅ©ng tÆ°Æ¡ng Ä‘á»‘i hoÃ&nbsp;n chá»‰nh, bao gá»“m cÃ¡c  máº«u tá»± Hy Láº¡p vÃ&nbsp; cÃ¡c kÃ½ hiá»‡u cá»§a AMS.

\begin{figure*}
\captiontitle[Fourier-GUTenberg]{\label{fig:fourier}Utopia trong vÄƒn báº£n thuáº§n cÃ¹ng vá»›i
 Fourier-GUTenberg toÃ¡n (\texttt{\textbackslash{}usepackage\{fourier\}}).}

\pic{vidupdf/fourier.pdf}
\end{figure*}
%
\begin{figure*}
\captiontitle[Math Design trong Utopia]{\label{fig:utopiamd} Utopia trong vÄƒn báº£n thuáº§n cÃ¹ng vá»›i Math Design toÃ¡n \captionbreak (\texttt{\textbackslash{}usepackage{[}utopia{]}\{mathdesign\}}).}

\pic{vidupdf/utopiamd.pdf}
\end{figure*}


\bigskip{}
Achim Blumensath Ä‘Ã£ dÃ¹ng \MF{} Ä‘á»ƒ táº¡o ra  gÃ³i \texttt{MnSymbol}~\cite{CTANmnsymbol}, gá»“m cÃ³ cÃ¡c kÃ½ hiá»‡u hÃ¬nh há»c (khÃ´ng cÃ³ cÃ¡c máº«u tá»± Hy Láº¡p hay cÃ¡c máº«u tá»± khÃ¡c cÃ³ hÃ¬nh dÃ¡ng giá»‘ng kÃ½ hiá»‡u) vá»›i cÃ¡c kÃ­ch thÆ°á»›c khÃ¡c nhau phÃ¹ há»£p vá»›i font Adobe MinionPro thÆ°Æ¡ng máº¡i.  GÃ³i \texttt{MnSymbol} Ä‘Æ°á»£c phÃ¢n phá»‘i miá»…n phÃ­, ngoÃ&nbsp;i ra cÃ²n cÃ³ cÃ¡c phiÃªn báº£n khÃ¡c á»Ÿ Ä‘á»‹nh dáº¡ng Type~1, tuy nhiÃªn muá»‘n dÃ¹ng gÃ³i \texttt{MinionPro} cá»§a Achim Blumensath, Andreas B\"uhmann, vÃ&nbsp; Michael Zedler~\cite{CTANminionpro} thÃ¬ pháº£i cÃ³ giáº¥y phÃ©p cá»§a Adobe cho bá»™ font MininonPro.





\section{\label{sec:Compar}So sÃ¡nh cÃ¡c Ä‘áº·c Ä‘iá»ƒm}

Báº£ng~\ref{cap:FeatureComparison} thá»ƒ  hiá»‡n  cÃ¡c Ä‘iá»ƒm khÃ¡c biá»‡t trong má»—i gÃ³i, trong Ä‘Ã³ cÃ¡c gÃ³i cÃ³ nhiá»u kÃ­ch cá»¡ lÃ&nbsp; Computer Modern, CM Bright, Concrete, Euler vÃ&nbsp; MnSymbol. Khi táº£i gÃ³i \texttt{eulervm} vÃ&nbsp;o tÃ&nbsp;i liá»‡u thÃ¬ cÃ¡c kÃ½ tá»± toÃ¡n kiá»ƒu Latin sáº½ Ä‘Æ°á»£c láº¥y tá»« italic font cá»§a thÃ¢n tÃ&nbsp;i liá»‡u. Dáº¥u sao sau tÃªn font xÃ¡c Ä‘á»‹nh ráº±ng gÃ³i tÆ°Æ¡ng á»©ng cÃ³ chá»©a kiá»ƒu font Ä‘Ã³ trong cÃ¡c font file cá»§a nÃ³.


\begin{sidewaystable}\centering\small

\begin{tabular}{lccccccc}
\hline 
$\;$GÃ³i&amp;
vÄƒn báº£n thuáº§n&amp;
máº«u tá»± Hy Láº¡p&amp;
CM kÃ½ hiá»‡u&amp;
AMS kÃ½ hiá»‡u&amp;
Hoa má»¹&amp;
 Báº£ng Ä‘en&amp;
toÃ¡n Ä‘áº­m\tabularnewline
\hline
computer modern&amp;
cm&amp;
cm&amp;
cm&amp;
ams&amp;
cm&amp;
ams&amp;
cÃ³\tabularnewline
cmbright&amp;
cmbright&amp;
cmbright&amp;
cm{*}&amp;
cm{*}&amp;
cm{*}&amp;
ams&amp;
khÃ´ng\tabularnewline
ccfonts,eulervm&amp;
concrete&amp;
euler&amp;
euler&amp;
ams&amp;
euler&amp;
ams&amp;
cÃ³\tabularnewline
concmath&amp;
concrete&amp;
concrete&amp;
concmath&amp;
concmath&amp;
concmath&amp;
concmath&amp;
khÃ´ng\tabularnewline
iwona&amp;
iwona&amp;
iwona&amp;
iwona&amp;
iwona&amp;
cm{*}&amp;
ams&amp;
cÃ³\tabularnewline
kurier&amp;
kurier&amp;
kurier&amp;
kurier&amp;
kurier&amp;
cm{*}&amp;
ams&amp;
cÃ³\tabularnewline
anttor&amp;
anttor&amp;
anttor&amp;
anttor&amp;
anttor&amp;
anttor&amp;
ams&amp;
cÃ³\tabularnewline
kmath,kerkis&amp;
kerkis&amp;
kerkis&amp;
txfonts&amp;
txfonts&amp;
txfonts&amp;
txfonts&amp;
cÃ³\tabularnewline
millennial&amp;
nc schlbk&amp;
millennial&amp;
txfonts&amp;
txfonts&amp;
txfonts&amp;
ams&amp;
khÃ´ng\tabularnewline
fouriernc&amp;
nc schlbk&amp;
fourier&amp;
fourier&amp;
fourier&amp;
fourier&amp;
fourier&amp;
cÃ³\tabularnewline
pxfonts&amp;
palatino&amp;
pxfonts&amp;
txfonts{*}&amp;
txfonts{*}&amp;
txfonts{*}&amp;
pxfonts&amp;
cÃ³\tabularnewline
mathpazo&amp;
palatino&amp;
pazo&amp;
cm&amp;
ams&amp;
cm&amp;
pazo&amp;
cÃ³\tabularnewline
mathpple&amp;
palatino&amp;
euler&amp;
euler&amp;
ams&amp;
cm&amp;
ams&amp;
cÃ³\tabularnewline
txfonts&amp;
times&amp;
txfonts&amp;
txfonts&amp;
txfonts&amp;
txfonts&amp;
txfonts&amp;
cÃ³\tabularnewline
mathtime \tiny{(Belleek)}&amp;
times&amp;
belleek&amp;
belleek&amp;
ams&amp;
cm&amp;
ams&amp;
khÃ´ng\tabularnewline
mathptmx&amp;
times&amp;
symbol&amp;
cm&amp;
ams&amp;
rsfs&amp;
ams&amp;
khÃ´ng\tabularnewline
mbtimes&amp;
omega&amp;
omega&amp;
mbtimes&amp;
ams&amp;
rsfs{*}&amp;
esstix&amp;
cÃ³\tabularnewline
arev&amp;
arev&amp;
arev&amp;
md charter&amp;
md charter&amp;
cm&amp;
fourier&amp;
cÃ³\tabularnewline
mathdesign \tiny{(Charter)}&amp;
charter&amp;
md charter&amp;
md charter&amp;
md charter&amp;
rsfs{*}&amp;
ams&amp;
cÃ³\tabularnewline
comicsans&amp;
comicsans&amp;
comicsans&amp;
cm&amp;
cm&amp;
cm&amp;
cm&amp;
cÃ³\tabularnewline
mathdesign \tiny{(Garamond)}&amp;
garamond&amp;
md garamond&amp;
md garamond&amp;
md garamond&amp;
rsfs{*}&amp;
ams{*}&amp;
cÃ³\tabularnewline
fourier&amp;
utopia&amp;
fourier&amp;
fourier&amp;
fourier&amp;
fourier&amp;
fourier&amp;
cÃ³\tabularnewline
mathdesign \tiny{(Utopia)}&amp;
utopia&amp;
md garamond&amp;
md utopia&amp;
md utopia&amp;
rsfs{*}&amp;
ams{*}&amp;
cÃ³\tabularnewline
\hline
\end{tabular}

\begin{center}\captiontitle[Comparison of features]{\label{cap:FeatureComparison}So sÃ¡nh cÃ¡c Ä‘áº·c Ä‘iá»ƒm cá»§a cÃ¡c gÃ³i}\end{center}

\end{sidewaystable}

Chá»‰ cÃ³ cÃ¡c font sans serif  vá»›i cÃ¡c font toÃ¡n phÃ¹ há»£p Ä‘Ã³ lÃ&nbsp;: CM Bright vÃ&nbsp;
Arev Sans, cáº£ hai font nÃ&nbsp;y Ä‘á»u thÃ­ch há»£p cho cÃ¡c slide trÃ¬nh chiáº¿u.  Computer Modern sans
serif, CM Bright, Arev Sans, Bera Sans, Kerkis Sans, Helvetica, vÃ&nbsp;
Avant Garde Ä‘á»u hoáº¡t Ä‘á»™ng giá»‘ng nhÆ° cÃ¡c font sans serif Ä‘i kÃ¨m vá»›i má»™t font roman sÆ¡ cáº¥p. Computer Modern kiá»ƒu Ä‘Ã¡nh mÃ¡y, \texttt{txtt} (from txfonts),
Luxi Mono~\cite{CTANluximono}, vÃ&nbsp; Bera Mono táº¥t cáº£ Ä‘á»u hoáº¡t Ä‘á»™ng tá»‘t nhÆ° cÃ¡c font kiá»ƒu Ä‘Ã¡nh mÃ¡y.

CÃ²n ráº¥t nhiá»u font miá»…n phÃ­ khÃ¡c dá»… dÃ¹ng vá»›i \LaTeX{}, trong Ä‘Ã³ Ä‘Ã¡ng chÃº Ã½ lÃ&nbsp; cÃ¡c font Bera , Luxi Mono, vÃ&nbsp; efont-serif~\cite{efont-serif}. Malte Rosenau Ä‘Ã£ chuyá»ƒn cÃ¡c font Bitstream Vera sang dáº¡ng Type~1 vÃ&nbsp; Ä‘á»•i tÃªn thÃ&nbsp;nh Bera~\cite{CTANbera}. Bera gá»“m cÃ³  cÃ¡c kiá»ƒu serif, sans, vÃ&nbsp; mono. Tuy nhiÃªn Bera Serif thÃ¬ khÃ´ng cÃ³ kiá»ƒu in nghiÃªng phÃ¹ há»£p, nhÆ°ng má»™t báº£n má»Ÿ rá»™ng cá»§a nÃ³ cÃ³ tÃªn lÃ&nbsp; DejaVu  bao gá»“m má»™t kiá»ƒu serif in nghiÃªng thá»±c, cÅ©ng nhÆ° cÃ¡c máº«u tá»± Hy Láº¡p vÃ&nbsp; hoa má»¹ cho ba kiá»ƒu trÃªn. Ngoáº¡i trá»« Bera Sans vÃ&nbsp; Arev Sans thÃ¬ cÃ¡c bá»™ font ká»ƒ trÃªn khÃ´ng cÃ³ cÃ¡c font toÃ¡n thÃ­ch há»£p.



\section{\label{sec:Creation}Thá»±c hiá»‡n bÃ&nbsp;i kháº£o sÃ¡t nÃ&nbsp;y}

CÃ³ thá»ƒ nÃ³i ráº±ng vá» máº·t ká»¹ thuáº­t thÃ¬ viá»‡c soáº¡n má»™t bÃ&nbsp;i kháº£o sÃ¡t vá» cÃ¡c font giá»‘ng nhÆ° bÃ&nbsp;i bÃ¡o nÃ&nbsp;y vÃ&nbsp;o má»™t tÃ&nbsp;i liá»‡u \TeX{} riÃªng láº». Tuy nhiÃªn bÃ&nbsp;i bÃ¡o nÃ&nbsp;y Ä‘Ã£ khÃ´ng dÃ¹ng phÆ°Æ¡ng phÃ¡p tÃ¢n thá»i nhÆ° váº­y vÃ¬ hai lÃ½ do.  Thá»© nháº¥t, viá»‡c thay Ä‘á»•i cÃ¡c font dÃ¹ng trong cÃ¹ng má»™t tÃ&nbsp;i liá»‡u lÃ&nbsp; má»™t viá»‡c hÆ¡i rá»‘i. CÃ¡c tÃ¡c giáº£ cá»§a cÃ¡c gÃ³i lá»‡nh \LaTeX{} Ä‘Ã£ máº¥t ráº¥t nhiá»u cÃ´ng sá»©c Ä‘á»ƒ thiáº¿t láº­p cÃ¡c font cho má»™t tÃ&nbsp;i liá»‡u, vÃ&nbsp; tháº­t lÃ&nbsp; dáº¡i dá»™t khi Ä‘i lÃ&nbsp;m láº¡i nhá»¯ng Ä‘iá»u mÃ&nbsp; cÃ¡c tÃ¡c giáº£ khÃ¡c Ä‘Ã£ táº¡o sáºµn. Thá»© nhÃ¬  lÃ&nbsp; chÃºng tÃ´i muá»‘n cho ngÆ°á»i Ä‘á»c  xem Ä‘Æ°á»£c káº¿t quáº£ chÃ­nh xÃ¡c mÃ&nbsp;  má»™t gÃ³i lá»‡nh nÃ&nbsp;o Ä‘Ã³ pháº£n áº£nh.

Äá»ƒ thá»±c hiá»‡n Ä‘Æ°á»£c cÃ¡c má»¥c tiÃªu Ä‘áº·t ra, má»™t file \LaTeX{} nhá» (xem HÃ¬nh~\ref{cap:SampleLaTeXfile}
lÃ&nbsp;m vÃ­ dá»¥) Ä‘Ã£ Ä‘Æ°á»£c táº¡o ra cho má»—i font táº£i tá»« cÃ¡c gÃ³i tÆ°Æ¡ng á»©ng, vÃ&nbsp; sau Ä‘Ã³ file vÃ­ dá»¥ máº«u dÃ¹ng chung  Ä‘Æ°á»£c táº£i vÃ&nbsp;o. BiÃªn dá»‹ch cÃ¡c file báº±ng \LaTeX{} rá»“i dÃ¹ng \texttt{dvips} vá»›i tÃ¹y chá»n -E Ä‘á»ƒ chuyá»ƒn chÃºng sang dáº¡ng  áº£nh EPS. TÃ¹y chá»n -E  táº¡o má»™t bounding box ráº¥t sÃ¡t xung quanh  vÄƒn báº£n. CÃ¡c file áº£nh nÃ&nbsp;y sáº½ Ä‘Æ°á»£c gá»i vÃ&nbsp;o file tÃ&nbsp;i liá»‡u máº¹ \texttt{survey.tex} vÃ&nbsp; file nÃ&nbsp;y Ä‘Ã£ Ä‘Æ°á»£c biÃªn dá»‹ch báº±ng \texttt{pdflatex}. KhÃ´ng hiá»ƒu vÃ¬ má»™t vÃ&nbsp;i lÃ½ do nÃ&nbsp;o Ä‘Ã³ mÃ&nbsp; \texttt{dvips} Ä‘Ã£ táº¡o ra má»™t file PS, hiá»ƒn thá»‹ khÃ´ng tá»‘t khi Ä‘Ã­nh kÃ¨m \texttt{mbtimes.eps}. HeVeA Ä‘Ã£ Ä‘Æ°á»£c dÃ¹ng Ä‘á»ƒ chuyá»ƒn trá»±c tiáº¿p \texttt{survey.tex}  sang HTML.%


\begin{figure}
\begin{quote}
\texttt{\textbackslash{}documentclass\{article\}}~\\
\texttt{\textbackslash{}include\{sampleformat\}}~\\
\texttt{\hspace*{.01em}~~\textbackslash{}usepackage\{fourier\}}~\\
\texttt{\textbackslash{}begin\{document\}}~\\
\texttt{\hspace*{.01em}~~\textbackslash{}include\{textfragment\}}~\\
\texttt{\textbackslash{}end\{document\}}
\end{quote}
\captiontitle[Sample \LaTeX{} file]{\label{cap:SampleLaTeXfile}File
\LaTeX{} máº«u cho font \texttt{fourier}. File \texttt{sampleformat.tex} lÃ&nbsp; file Ä‘á»‹nh dáº¡ng trang  cho cÃ¡c vÃ­ dá»¥ máº«u, chá»©a cÃ¡c thÃ´ng tin vá» lá» giáº¥y, xÃ³a sá»‘ trang. File \texttt{textfragment.tex} lÃ&nbsp; file nguá»“n chá»©a ná»™i dung chÃ­nh cá»§a cÃ¡c file vÃ­ dá»¥ máº«u font dÃ¹ng trong  tÃ&nbsp;i liá»‡u nÃ&nbsp;y. Cáº£ hai file nÃ&nbsp;y Ä‘á»u Ä‘Æ°á»£c dÃ¹ng Ä‘áº¿n cho má»—i vÃ­ dá»¥. CÃ²n dÃ²ng lá»‡nh {}``\texttt{\textbackslash{}usepackage\{fourier\}}'' sáº½ Ä‘Æ°á»£c thay Ä‘á»•i trong cÃ¡c vÃ­ dá»¥ cho cÃ¡c gÃ³i tÆ°Æ¡ng á»©ng.}

\end{figure}



\subsection*{Lá»i cáº£m Æ¡n}
TÃ¡c giáº£ xin chÃ¢n thÃ&nbsp;nh gá»­i lá»i cáº£m Æ¡n Ä‘áº¿n
Michael Zedler, Ulrik Vieth, Karl Berry, William Slough,
vÃ&nbsp; nhá»¯ng ngÆ°á»i khÃ¡c Ä‘Ã£ cÃ³ nhá»¯ng nháº­n xÃ©t quÃ½ bÃ¡u.

\begin{thebibliography}{10}
\bibitem{CTANfontinstgd} Philipp Lehman, The Font Installation Guide cÃ³ trÃªn \CTAN{/info/Type1fonts/fontinstallationguide}.
\bibitem{CTANmetatype1}Bogus\l{}aw Jackowski, Janusz M. Nowacki, and Piotr Strzelczyk, MetaType1
cÃ³ trÃªn \CTAN{/fonts/utilities/metatype1}
\bibitem{WASmathfonts}Walter A. Schmidt, Mathematikschriften f\"ur \LaTeX{}, \url{http://home.vr-web.de/was/mathfonts.html}.
\bibitem{bluesky}American Mathematical Society (AMS) webpage for Computer Modern Type~1
fonts, \url{http://www.ams.org/tex/type1-fonts.html}.
\bibitem{CMBook}Donald E. Knuth, \emph{Computer Modern Typefaces}, Addison-Wesley
Pub. Co., 1986.
\bibitem{CMRgain}Raph Levien, Effect of gain on appearance of Computer Modern, \url{http://levien.com/type/cmr/gain.html}.
\bibitem{DigTyp}Donald E. Knuth, \emph{Digital Typography}, Stanford, California:
Center for the Study of Language and Information, 1999.
\bibitem{CTANbluesky}Blue Sky Research and Y\&amp;Y, Inc., Computer Modern Type~1 fonts cÃ³ trÃªn
\CTAN{/fonts/cm/ps-type1/bluesky}.
\bibitem{CTANbakoma}Basil K. Malyshev, BaKoMa Computer Modern Type~1 and TrueType fonts
cÃ³ trÃªn \CTAN{/fonts/cm/ps-type1/bakoma}.
\bibitem{CTANec}J\"org Knappen and Norbert Schwarz, European Computer Modern fonts
cÃ³ trÃªn \CTAN{/fonts/ec}.
\bibitem{CTANtt2001}Szab\'o P\'eter, Tt2001 fonts cÃ³ trÃªn \CTAN{/fonts/ps-type1/tt2001}.
\bibitem{textrace}Szab\'o P\'eter, webpage for \texttt{textrace} and Tt2001 fonts,
\url{http://www.inf.bme.hu/~pts/textrace}.
\bibitem{CTANcm-super}Vladimir Volovich, CM-Super cÃ³ trÃªn \CTAN{/fonts/ps-type1/cm-super}.
\bibitem{CM-Super}Vladimir Volovich, \TUGboat{tb24-1/volovich.pdf}{CM-Super}: Automatic
creation of efficient Type~1 fonts from \MF\  fonts, \emph{TUGboat},
24 (1) 2003, 75--78.
\bibitem{CTANlm}Bogus\l{}aw Jackowski and Janusz M. Nowacki, Latin Modern cÃ³ trÃªn \CTAN{/fonts/ps-type1/lm}.
\bibitem{LatinModern}Bogus\l{}aw Jackowski and Janusz M. Nowacki, \TUGboat{tb24-1/jackowski.pdf}{Latin
Modern}: Enhancing Computer Modern with accents, accents, accents,
\emph{TUGboat}, 24 (1) 2003, 64--74.
\bibitem{texpower}\TeX{}Power \LaTeX{} style files by Stephan Lehmke, \url{http://texpower.sourceforge.net}.
\bibitem{CTANcmbright}Walter A. Schmidt, CM Bright cÃ³ trÃªn \CTAN{/fonts/cmbright}.
\bibitem{CTANhfbright}Harald Harders, hfbright cÃ³ trÃªn \CTAN{/fonts/ps-type1/hfbright}.
\bibitem{concretebook}Ronald L. Graham, Donald E. Knuth, and Oren Patashnik, \emph{Concrete
Mathematics,} Addison-Wesley, 1989.
\bibitem{CTANconcmath}Ulrik Vieth, Concrete Math fonts cÃ³ trÃªn \CTAN{/fonts/concmath}.
\bibitem{CTANccfonts}Walter Schmidt, ccfonts cÃ³ trÃªn \CTAN{/macros/latex/contrib/ccfonts}.
\bibitem{CTANeulervm}Walter Schmidt, eulervm cÃ³ trÃªn \CTAN{/fonts/eulervm}.
\bibitem{eulervm}Walter Schmidt, \TUGboat{tb23-3-4/tb75schmidt.pdf}{Euler-VM}: Generic
math fonts for use with \LaTeX{}, \emph{TUGboat}, 23 (3/4) 2002, 301--303.
\bibitem{CTANiwona}Janusz M. Nowacki, Iwona cÃ³ trÃªn \CTAN{/fonts/iwona}.
\bibitem{CTANkurier}Janusz M. Nowacki, Kurier cÃ³ trÃªn \CTAN{/fonts/kurier}.
\bibitem{CTANantp}Janusz M. Nowacki, Antykwa P\'o\l{}tawskiego cÃ³ trÃªn \CTAN{/fonts/psfonts/polish/antp}.
\bibitem{CTANantt}Janusz M. Nowacki, Antykwa Toru\acuten{}ska cÃ³ trÃªn \CTAN{/fonts/antt}.
\bibitem{AntTorunska}Janusz M. Nowacki, \TUGboat{tb19-3/tb60antyk.pdf}{Antykwa Toru\acuten{}ska}:
an electronic replica of a Polish traditional type, \emph{TUGboat},
19 (3) 1998, 242--243.
\bibitem{CTANpsnfss}Sebastian Rahtz and Walter A. Schmidt, PSNFSS cÃ³ trÃªn \CTAN{/macros/latex/required/psnfss}.
\bibitem{Kerkis}Antonis Tsolomitis, The \TUGboat{tb23-3-4/tb75tsol.pdf}{Kerkis}
font family, \emph{TUGboat}, 23 (3/4) 2002, 296--301.
\bibitem{CTANkerkis}Antonis Tsolomitis, Kerkis cÃ³ trÃªn \CTAN{/fonts/greek/kerkis}.
\bibitem{CTANfouriernc}Michael Zedler, fouriernc cÃ³ trÃªn \CTAN{/fonts/fouriernc}.
\bibitem{CTANpxfonts}Young Ryu, pxfonts cÃ³ trÃªn \CTAN{/fonts/pxfonts}.
\bibitem{CTANmathpazo}Diego Puga, Pazo Math fonts cÃ³ trÃªn \CTAN{/fonts/mathpazo}.
\bibitem{CTANfpl}Ralf Stubner, FPL font cÃ³ trÃªn \CTAN{/fonts/fpl}.
\bibitem{fplneu}Walter Schmidt, FPL Neu package, \url{http://home.vr-web.de/was/x/FPL/}.
\bibitem{CTANtxfonts}Young Ryu, txfonts cÃ³ trÃªn \CTAN{/fonts/txfonts}.
\bibitem{CTANbelleek}Richard Kinch, Belleek fonts cÃ³ trÃªn \CTAN{/fonts/belleek}.
\bibitem{Belleek}Richard J. Kinch, \TUGboat{tb19-3/tb60kinch.pdf}{Belleek}: A call
for \MF\  revival, \emph{TUGboat}, 19 (3) 1998, 244--249.
\bibitem{STIX}STIX Fonts project, \url{http://www.stixfonts.org}.
\bibitem{mbtimes}Michel Bovani, mbtimes at \url{ftp://ftp.gutenberg.eu.org/pub/gut/distribs/mbtimes/}.
\bibitem{Omega}John Plaice and Yannis Haralambous, Omega at \url{http://omega.enstb.org}.
\bibitem{MgOpenModerna}MgOpenModerna, one of the MgOpen fonts, \url{http://www.ellak.gr/fonts/mgopen}.
\bibitem{FreeSans}FreeSans, one of the Free UCS Outline Fonts, \url{http://savannah.nongnu.org/projects/freefont}.
\bibitem{vera}Bitstream Vera, released by Bitstream in cooperation with the Gnome
Foundation, \url{http://www.gnome.org/fonts}.
\bibitem{CTANbera}Malte Rosenau, Bera Postscript Type~1 fonts (chuyá»ƒn tá»« cÃ¡c font Bitstream
Vera, vÃ&nbsp; Ä‘Ã£ Ä‘Æ°á»£c Ä‘á»•i tÃªn)  vÃ&nbsp;  cÃ¡c file \LaTeX{} há»— trá»£ cá»§a Walter~A. Schmidt, cÃ³ trÃªn \CTAN{/fonts/bera}.
\bibitem{CTANarev}Tavmjong Bah and Stephen Hartke, Arev Sans cÃ³ trÃªn \CTAN{/fonts/arev}.
\bibitem{arev}Tavmjong Bah, Arev Sans, \url{http://tavmjong.free.fr/FONTS}.
\bibitem{CTANcharter}Bitstream Charter cÃ³ trÃªn \CTAN{/fonts/charter}.
\bibitem{CTANmathdesign}Paul Pichaureau, Math Design fonts cÃ³ trÃªn \CTAN{/fonts/mathdesign}.
\bibitem{CharisSIL}Charis SIL, \url{http://scripts.sil.org/cms/scripts/page.php?site_id=nrsi&amp;item_id=CharisSILfont}.
\bibitem{comicsans}Comic Sans, part of Microsoft's core web fonts, cÃ³ táº¡i \url{http://corefonts.sourceforge.net/}.
\bibitem{CTANcomicsans}Scott Pakin, Comic Sans \LaTeX{} package cÃ³ trÃªn \CTAN{/macros/latex/contrib/comicsans}.
\bibitem{CTANgaramond}URW Garamond cÃ³ trÃªn \CTAN{/fonts/urw/garamond}.
\bibitem{CTANutopia}Adobe Utopia cÃ³ trÃªn \CTAN{/fonts/utopia}.
\bibitem{CTANfourier}Michel Bovani, Fourier-GUTenberg cÃ³ trÃªn \CTAN{/fonts/fourier-GUT}.
\bibitem{CTANmnsymbol}Achim Blumensath, MnSymbol cÃ³ trÃªn \CTAN{/fonts/mnsymbol}.
\bibitem{CTANminionpro}Achim Blumensath, Andreas B\"uhmann, and Michael Zedler, MinionPro
cÃ³ trÃªn \CTAN{/fonts/minionpro}.
\bibitem{dejavu}DejaVu fonts, \url{http://dejavu.sourceforge.net}.
\bibitem{CTANluximono}Luxi Mono cÃ³ trÃªn \CTAN{/fonts/LuxiMono}.
\bibitem{efont-serif}efont-serif at \url{http://openlab.jp/efont/serif/}.
\end{thebibliography}
\begin{comment}
Victor Gaultney, Gentium at \url{http://scripts.sil.org/gentium}.

Michael Zedler, gentium at \url{http://www.hft.ei.tum.de/mz/ggn.tar.bz2}.
\end{comment}
%filler to avoid comment environment as last line
\end{document}
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