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In a WordPress blog post of mine I used the following LaTeX code:

$\setlength{\unitlength}{1cm}
\begin{picture}(8,6)\thicklines
\put(1,1){\line(3,4){3}}
\put(4,5){\line(3,-4){3}}
\put(1,1){\line(1,0){6}}
\put(2.3,3.2){\textit{b}}
\put(5.7,3.1){\textit{a}}
\put(3.8,0.5){\textit{c}}
\put(4,2.7){\textit{S}}
\put(0.6,0.5){\textit{A}}
\put(7.1,0.5){\textit{B}}
\put(3.8,5.3){\textit{C}}
\end{picture}$

to draw a triangle. I tried to do the same in this answer but it didn't parse.

Question: Is this feature not allowed/supported?

Added: From the Willie Wong's comment to J. M.'s answer it seems this is due to the existing design of the system. Is that so?

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It's not in this list, so I guess not.

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    $\begingroup$ MathJAX is for type setting mathematics. It only supports that subset of the LaTeX features. As an aside: WordPress doesn't use MathJAX. WordPress pipes the LaTeX code to a real processor (probably TeXLive), gets an image output, and pastes the image output into the post. Which adversely affects the print quality. $\endgroup$ – Willie Wong Aug 5 '11 at 16:13
  • $\begingroup$ @Willie Wong: Thanks! Where can I get a short description of MathJAX? $\endgroup$ – Américo Tavares Aug 5 '11 at 16:43
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    $\begingroup$ @Américo: is the official mathjax.org page good enough? $\endgroup$ – t.b. Aug 5 '11 at 18:58
  • $\begingroup$ @Theo: Yes, it is. Thanks! $\endgroup$ – Américo Tavares Aug 5 '11 at 19:23

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