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$$ \chi^2 = \sum_{i=1}^N
          \left(y_i - (a + b x_i)
	  \over \sigma_i\right)^2 $$
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tex \TeX
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${x^i}\over{\tan y}$
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$a \backslash{} b$
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$\mathtt{math code} a < b$
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$\underline{\mathtt{math \hbox{ code }}} \sum_{i}{\underline{\mathit{eff}}}$
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$\sum_{i} f(x)^{2}$
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\[-- f(x) = {1 \over \sigma \sqrt{2\pi}}e^{-{1 \over 2}\left({x-\mu \over \sigma}\right)^2}
\]
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