Kt Circled Character

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    Ky thu .t nh,

    o trong LATEXL .nh lam khoanh tron ho .ac vung cac ky t .u

    ,

    ho .ac ky hi .u

    Nguyn Hu,

    u i,

    n

    Khoa Toan - Co,

    - Tin h .oc

    HKHTN Ha N.i, HQGHN

    M .uc l .uc

    1 Gio,

    i thi .u 1

    2 Nhu,

    ng l .nh lam khung ky t .u,

    va ky hi .u 1

    1 Gio,

    i thi .u

    ,

    ch,

    nh van b,

    an trong LATEX cho d .ep co rt nhiu ky thu .t vvi .c nay, v d .u dung phng,

    dung cac l .nh co san ho .ac xy d .u

    ,

    ng l .nh d,

    lam vi .c do cho thch h .o,

    p. Lo .at bai noi v

    ky thu .t trong LATEX ti tm toi va trnh by nhu

    ,

    ng vn d nu bit th qua d khi lam cho

    van b,

    an d .ep. Ky thu .t qua do,

    n gi,

    an nhiu khi ngu,

    o,

    i dung khng d,

    y va ap d .ung no.

    2 Nhu,

    ng l .nh lam khung ky t .u,

    va ky hi .u

    1. Trong goi l .nh amsmath.sty va amssymbol.sty co l .nh lam khoanh tron ky t .u,

    nh,

    o

    \textcircled{c}, \textcircled{a},

    \textcircled{b}

    c, a, b

    Nhu,

    ng vo,

    i cac ky t .u,

    lo,

    n th khng d .ep nu,

    a

    \textcircled{C}, \textcircled{A},

    \textcircled{B}

    C, A, B

    1

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    hp://nhdien.wordpress.com -Nguy n H u,

    u i,

    n 2

    2. ,

    khac ph .uc diu nay ta du,

    a vao d.inh ngha

    \newsavebox{\circlebox}

    \savebox{\circlebox}{\fontencoding{OMS}\selectfont\Large\char13}\newlength{\circleboxwdht}

    \newcommand{\centercircle}[1]{%

    \setlength{\circleboxwdht}{\wd\circlebox}%

    \addtolength{\circleboxwdht}{\dp\circlebox}%

    \raisebox{0.4\dp\circlebox}{%

    \parbox[][\circleboxwdht][c]{\wd\circlebox}{\centering#1}}%

    \llap{\usebox{\circlebox}}%

    }

    \centercircle{1} \centercircle{a}\\

    \centercircle{A}

    \centercircle{$\because$}\\

    \centercircle{F}

    \centercircle{$\alpha$}

    1 a

    A

    F

    3. Dung goi l .nh pifont.sty

    \ding{172}\ding{173}\ding{174} ...\\

    \ding{182}\ding{183}\ding{184} ...\\\ding{192}\ding{193}\ding{194} ...\\

    \ding{202}\ding{203}\ding{204} ...

    ...

    ...

    ...

    ...

    4. Trong goi l .nh amsmath.sty,amssymb.sty co th,

    dung l .nh\fbox d,

    lam hnh vung

    bao quanh ky t .u,

    .

    \fbox{A} \fbox{C}\\

    \fbox{a} \fbox{c}\\

    \fbox{1} \fbox{2}

    A C

    a c

    1 2

    5. ,

    co hnh vung d .ep dung goi l .nh

    \framebox[1.5em]{\mathstrut 1}

    \framebox[1.5em]{\mathstrut a}

    \framebox[1.5em]{\mathstrut A}

    \framebox[1.5em]{\mathstrut 12}

    \framebox[1.5em]{\mathstrut $\because$}

    \framebox[1.5em]{\mathstrut F}

    1 a A 12

    F

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    hp://nhdien.wordpress.com -Nguy n H u,

    u i,

    n 3

    6. ,

    co hnh oval dung goi l .nh fancybox.sty

    \cornersize{0.5}\ovalbox{$\because$}\\\cornersize{1}\ovalbox{$\because$}\\

    \cornersize{2}\ovalbox{$\because$}

    7. .inh ngha toan t,

    u,

    \newcommand{\Boxed}[1]{\mathbin{\ooalign{$\Box$\crcr

    \hidewidth

    \raise0.55ex\hbox{$\scriptscriptstyle{#1}$}%

    \hidewidth

    }}}

    $A\Boxed{a}B$

    $$A\Boxed{a}B$$

    $A\Boxed{\phi}B$

    $$A\Boxed{\phi}B$$

    Aa B

    Aa B

    A B

    A B

    8. T .ai m .t trang web Nh .t b,

    an d.inh ngha macro sau:

    \newsavebox{\hsbox}

    \savebox{\hsbox}{\fontencoding{OMS}\selectfont\Large\char125} %% 126: heart

    \newlength{\hsboxwdht}

    \newcommand{\hishigata}[1]{%

    \setlength{\hsboxwdht}{\wd\hsbox}%

    \addtolength{\hsboxwdht}{\dp\hsbox}%

    \raisebox{0.4\dp\hsbox}{%

    \parbox[][\hsboxwdht][c]{\wd\hsbox}{\centering\small #1}}%\llap{\usebox{\hsbox}}%

    }

    \hishigata{1} \hishigata{a} \hishigata{A}

    1 a A

    \newsavebox{\batu}

    \savebox{\batu}{\fontencoding{OMS}\selectfont\Large\char2}

    \newlength{\batuwdht}

    \newcommand{\batten}[1]{%

    \setlength{\batuwdht}{\wd\batu}%

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    hp://nhdien.wordpress.com -Nguy n H u,

    u i,

    n 4

    \addtolength{\batuwdht}{\dp\batu}%

    \raisebox{0.4\dp\batu}{%

    \parbox[][\batuwdht][c]{\wd\batu}{\centering#1}}%

    \llap{\usebox{\batu}}%

    }

    \batten{1} \batten{a} \batten{A}

    1 a A

    \newsavebox{\sankaku}

    \savebox{\sankaku}{\fontencoding{OMS}\selectfont\Large\char52}

    \newlength{\sankakuwdht}

    \newcommand{\triangled}[1]{%

    \setlength{\sankakuwdht}{\wd\sankaku}%\addtolength{\sankakuwdht}{\dp\sankaku}%

    \raisebox{0.6\dp\sankaku}{%

    \parbox[][\sankakuwdht][c]{\wd\sankaku}{\centering\small #1}}%

    \llap{\usebox{\sankaku}}%

    }

    \triangled{1} \triangled{a} \triangled{A}

    1 a A

    \newsavebox{\Rsankaku}\savebox{\Rsankaku}{\fontencoding{OMS}\selectfont\Large\char53}

    \newlength{\Rsankakuwdht}

    \newcommand{\Rtriangled}[1]{%

    \setlength{\Rsankakuwdht}{\wd\Rsankaku}%

    \addtolength{\Rsankakuwdht}{\dp\Rsankaku}%

    \raisebox{0.4\dp\Rsankaku}{%

    \parbox[][\Rsankakuwdht][c]{\wd\Rsankaku}{\centering\small #1}}%

    \llap{\usebox{\Rsankaku}}%

    }

    \Rtriangled{1} \Rtriangled{a}

    \Rtriangled{A}

    1 a A

    9. V d .u chung

    \triangled{0}\triangled{1}\triangled{2}

    \triangled{3}\triangled{4}\triangled{5}

    \triangled{6}\triangled{7}\triangled{8}

    \triangled{9}

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    hp://nhdien.wordpress.com -Nguy n H u,

    u i,

    n 5

    \Rtriangled{0}\Rtriangled{1}\Rtriangled{2}

    \Rtriangled{3}\Rtriangled{4}\Rtriangled{5}

    \Rtriangled{6}\Rtriangled{7}\Rtriangled{8}

    \Rtriangled{9}

    0 1 2 3 4 5 6 7 8 9

    0 1 2 3 4 5 6 7 8 9