More math ${\xi }_{(even-in-the-title-!)}$

Wow this really works !

A compilation of $LATEX$ formulas…

Matrix

$$\begin{array}{cc}\alpha & {\beta }^{\ast }\\ {\gamma }^{\ast }& \delta \end{array}$$

$$\left[\begin{array}{cc}\alpha & {\beta }^{\ast }\\ {\gamma }^{\ast }& \delta \end{array}\right]$$

$$\Vert \begin{array}{cc}\alpha & {\beta }^{\ast }\\ {\gamma }^{\ast }& \delta \end{array}\Vert$$

Limits

$$\underset{n\to \mathrm{\infty }}{lim}\sum _{k=1}^n\frac{1}{k^2}=\frac{{\pi }^2}{6}$$

$$\underset{n\to \mathrm{\infty }}{lim}\frac{1}{x^n}=0$$

Various symbols

$$\lambda ,\xi ,\pi ,\theta ,\mu ,\mathrm{\Phi },\mathrm{\Omega },\mathrm{\Delta }$$