possibilita escrever fórmulas bem apresentáveis, através de uma sintaxe simples, utilizando apenas texto.Para utilizar este recurso no fórum, utilize o BBCode tex:
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[tex] [/tex]
Para saber mais sobre o assunto, veja links no rodapé deste tópico.
Alguns exemplos de utilização:
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[tex]f(x)=x^2[/tex]
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[tex]f(x)=x^n+x^{(n-1)}[/tex]
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[tex]x=\sqrt{a^2+b^2}[/tex]
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[tex]-10\leq x\leq 10[/tex]
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[tex]e^x=\sum_{n=0}^\infty\frac{x^n}{n!}[/tex]
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[tex]f^\prime(x)\ = \lim_{\Delta x\to0}\frac{f(x+\Delta x)-f(x)}{\Delta x}[/tex]
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[tex]f(x)=\int\limits_{-\infty}^x~e^{-t^2}dt[/tex]
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[tex]e^x=\sum_{n=0}^\infty\frac{x^n}{n!}[/tex]
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[tex]e^x=\lim_{n\to\infty} \left(1+\frac~xn\right)^n[/tex]
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[tex]f^\prime(x)\ = \lim_{\Delta x\to0}\frac{f(x+\Delta x)-f(x)}{\Delta x}[/tex]
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\begin{displaymath}
\sum_{\substack{0<i<n \\ 1<j<m}}
P(i,j) =
\sum_{\begin{subarray}{l} i\in I\\
1<j<m
\end{subarray}} Q(i,j)
\end{displaymath}
![\begin{displaymath}
\mathop{\mathrm{corr}}(X,Y)=
\frac{\displaystyle
\sum_{i=1}^n(x_i-\overline x)
(y_i-\overline y)}
{\displaystyle\biggl[
\sum_{i=1}^n(x_i-\overline x)^2
\sum_{i=1}^n(y_i-\overline y)^2
\biggr]^{1/2}}
\end{displaymath}](/latexrender/pictures/300ff9a962bd8e281b3d8c40f203ce32.png "\begin{displaymath}
\mathop{\mathrm{corr}}(X,Y)=
\frac{\displaystyle
\sum_{i=1}^n(x_i-\overline x)
(y_i-\overline y)}
{\displaystyle\biggl[
\sum_{i=1}^n(x_i-\overline x)^2
\sum_{i=1}^n(y_i-\overline y)^2
\biggr]^{1/2}}
\end{displaymath}")
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\begin{displaymath}
\mathop{\mathrm{corr}}(X,Y)=
\frac{\displaystyle
\sum_{i=1}^n(x_i-\overline x)
(y_i-\overline y)}
{\displaystyle\biggl[
\sum_{i=1}^n(x_i-\overline x)^2
\sum_{i=1}^n(y_i-\overline y)^2
\biggr]^{1/2}}
\end{displaymath}
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\begin{displaymath}
\mathbf{X} =
\left( \begin{array}{ccc}
x_{11} & x_{12} & \ldots \\
x_{21} & x_{22} & \ldots \\
\vdots & \vdots & \ddots
\end{array} \right)
\end{displaymath}
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\setlength{\unitlength}{1mm}
\begin{picture}(60,40)
\put(30,20){\vector(1,0){30}}
\put(30,20){\vector(4,1){20}}
\put(30,20){\vector(3,1){25}}
\put(30,20){\vector(2,1){30}}
\put(30,20){\vector(1,2){10}}
\thicklines
\put(30,20){\vector(-4,1){30}}
\put(30,20){\vector(-1,4){5}}
\thinlines
\put(30,20){\vector(-1,-1){5}}
\put(30,20){\vector(-1,-4){5}}
\end{picture}
Caso ainda não conheça a sintaxe, enquanto se acostuma, ou mesmo por preferência, você pode utilizar algum recurso WYSIWYG (what you see is what you get), como por exemplo:
http://test.izyba.com/equationeditor/equationeditor.php (Equation Editor online)
http://www.dessci.com/en/products/texaide/ (TeXaide para Windows)
Sobre o
:LaTeX Rendering Class 0.8
Copyright (C) 2003/2004 Benjamin Zeiss <zeiss@math.uni-goettingen.de>
Maintained from version 0.7 by Steve Mayer
----------------------
LatexRender is a set of scripts that allows one to call LaTeX (or mimeTeX) from PHP programs;
in particular, this allows users to enter LaTeX commands in a forum and, on posting,
have it replaced by a suitable gif or png. LatexRender requires either LaTeX and
ImageMagick or mimeTeX to be installed. The open source PHP code was originally
designed for use with phpBB, but it can be adapted for use with other PHP programs.
Details and example installations are given at http://www.mayer.dial.pipex.com/tex.htm#latexrender
-----------------------
Sobre a pronúncia:
Pronouncing and writing "LaTeX"
LaTeX is usually pronounced ['lei.tEk] or ['la.tEk] in English (that is, not with the [ks] pronunciation English speakers normally associate with X, but with a [k]). The last character in the name comes from a capital Χ (chi), as the name of TeX derives from the Greek τέχνη (skill, art, technique); for this reason, TeX's creator Donald Knuth promotes a /tEx/ pronunciation (that is, with a voiceless velar fricative as in Modern Greek, or the last sound of Scottish "loch" or German "Bach" or Arabic "خ"). Lamport, on the other hand, has said he does not favor or discourage any pronunciation for LaTeX.
The name is traditionally printed with the special typographical logo shown on this page. In media where the logo cannot be precisely reproduced in running text, the word is typically given the unique capitalization LaTeX to avoid confusion with the word “latex”.
Fonte: http://en.wikipedia.org/wiki/LaTeX#Pronouncing_and_writing_.22LaTeX.22
Informações sobre a alternativa mimeTeX, caso não tenha LaTeXRender disponível no servidor:
John Forkosh
http://www.forkosh.com/mimetex.html
Fórum relacionado no phpBB:
http://www.phpbb.com/community/viewtopic.php?t=94454
Para outros detalhes, alguns exemplos utilizados neste tópico, informações técnicas e sintaxe, visite:
http://www.mayer.dial.pipex.com/tex.htm#latexrender
Caso já tenha o pacote LatexRender baixado e queira instalar o MOD PHPBB3:
http://www.phpbb.com/community/viewtopic.php?p=2669402
