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$\displaystyle disp--laymath
f(x) = {1 \over \sigma \sqrt{2\pi}}e^{-{1 \over 2}\left({x-\mu \over \sigma}\right)^2}
$
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$\displaystyle \imath{} \jmath{}
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$\displaystyle \partial_t \eta (t) = g(\eta(t),\varphi(t))$
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