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$$\left( \begin {array}{ccc} a & b & c \\ d & e & f \\ g & h & i \end{array} \right)$$ $$m = \frac{m_0}{\sqrt{1-\frac{v^2}{c^2}}}$$ $$0=a_{11} + a_{12}$$ $$x^{a+b}=x^ax^b$$ $$x_i=\sqrt[n]{\frac{a_i}{b_i}}$$ $$\left( \begin{array}{cc} \alpha& \beta^{*}\\ \gamma^{*}& \delta \end{array} \right)$$ $$\int_{\vert x-x_0 \vert < X_0}\Phi(x)$$ $$\int\limits_{\vert x-x_0 \vert < X_0}\Phi(x)$$ $$\oint F(x)dx$$ $$\iint \Phi(x, y)dxdy$$ $$\sum\limits_{0 \le i \le m , 0 < j < n}P(i, j)$$ $$\lim_{n \rightarrow \infty} \frac {n*l}{2*r} = \pi$$ $${n \choose r} = \frac{n!}{r! (n - r)!}$$ $$x'+x'' = \dot x + \ddot x$$ $$\mathbf{\vec {v}} = a\hat x + b\hat y$$ $$A\xleftarrow{n+\mu-1}B \xrightarrow[T]{n\pm i-1}C$$ $$\begin{matrix}A \xrightarrow{\;\;\;f\;\;\;}B\\\pi\downarrow{\;\;\;\;\;}\;\;\;\uparrow{} \phi\\C\xrightarrow{\;\;\;g\;\;\;}D\end{matrix}$$ $$f(x)=\begin{cases} \begin{matrix} 0 & si\; x>0 \\ x^2 & si\;no \end{matrix} \end{cases}$$ $$B\xrightarrow{\rm tomorrow}C$$ Otros enlaces: LaTeX:Commands