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# KaTeX Testing | Forum

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The *Gamma function* satisfying $\Gamma(n) = (n-1)!\quad\forall n\in\mathbb N$ is via the Euler integral
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The Gamma function satisfying \Gamma(n) = (n-1)!\quad\forall n\in\mathbb N is via the Euler integral

\Pi(z) = \int_0^\infty t^{z-1}e^{-t}dt\,.

\pi*\phi=

1. To see how any formula was written in any question or answer, including this one, right-click on the expression and choose "Show Math As > TeX Commands". (When you do this, the '$' will not display. Make sure you add these: see the next point. There are also other ways to view the code for the formula or the whole post.) 2. For inline formulas, enclose the formula in$…$. For displayed formulas, use $$…$$. These render differently. For example, type$\sum_{i=0}^n i^2 = \frac{(n^2+n)(2n+1)}{6}\$
to show $$∑ni=0i2=(n2+n)(2n+1)6$$ (which is inline mode) or type
$$\sum_{i=0}^n i^2 = \frac{(n^2+n)(2n+1)}{6}$$
to show$$n∑i=0i2=(n2+n)(2n+1)6$$(which is display mode).