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<p></p><p></p><p>用的是群里枝下珂画的,比较符合中文的习惯</p><pre class="brush:plain;toolbar:false">\newcommand*\zhcong{% %全等 congruent
\mathrel{\text{%\small%
\tikz \draw[baseline] (-.2em,1.35ex) .. controls (-.46em,1.6ex) and (-.54em,.65ex) .. (-.25em,.65ex) .. controls (-.06em,.65ex) and (.06em,1.35ex) .. (.25em,1.35ex) .. controls (.54em,1.35ex) and (.46em,.4ex) .. (.2em,.65ex) (-.46em,.4ex) -- (.46em,.4ex) (-.46em,0ex) -- (.46em,0ex);%
}}}</pre><p><br/></p><p>顺便给出中文化的相似符号,也是枝下珂画的,我只是一个传递工</p><pre class="brush:plain;toolbar:false">\newcommand*\zhsim{% %相似 similar
\mathrel{\text{%
\tikz \draw[baseline] (-.25em,1.15ex) .. controls (-.55em,1.15ex) and (-.51em,.23ex) .. (-.275em,.23ex) .. controls (0,.23ex) and (0,1.15ex) .. (.275em,1.15ex) .. controls (.51em,1.15ex) and (.55em,.23ex) .. (.25em,.23ex);%
}}}</pre><p><br/></p><p>只列举全等的吧,\[\triangle{ABC}\zhcong{\triangle{A'B'C'}}\]</p><p><br/></p><p>效果如下</p><p><img src="/data/ueditor/php/upload/image/20190815/1565858124379525.png" title="1565858124379525.png" alt="0.png"/></p><p></p><p></p>
5
<p>其实看看 symbols-a4.pdf 就能够找到办法。10.3 Where can I find the symbol for...?</p><p>这一节提到了旋转和镜像盒子的办法,所以:</p><pre class="brush:plain;toolbar:false">\documentclass{article}
\usepackage{graphicx}
\newcommand\backcong{\mathrel{\reflectbox{$\cong$}}}
\begin{document}
$\backcong$
\end{document}</pre><p>就行了。</p>
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