The sum $\quad\sum_{n=1}^\infty n\quad$ is equal to $-\frac{1}{12}$. On the other hand, the integral $\int_0^\infty e^{-x^2} dx = \frac12 \pi^{1/2}$.
Displayed equations should be possible with single dollars inside blackquote.../blockquote:
$\tau\to \tau^\prime = \frac{a \tau + b}{c \tau+ d}, \quad \left(\begin{array}{cc}a&b\\ c&d\end{array}\right)\in SL(2,Z)$Note that before the page fully loads, you see the LaTeX sources. But suddenly, they should be converted into beautiful mathematics if you have installed either MathPlayer or Techexplorer.
Update 2011: I replaced LaTeXMathML.js by MathJax which seems superior; search for Mathjax on this blog.
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