I love Math!

Some inline Latex: $a^2 + b^2 = c^2$

When $a \ne 0$, there are two solutions to (ax^2 + bx + c = 0) and they are $x = {-b \pm \sqrt{b^2-4ac} \over 2a}.$

Display equation:

$$\int e^{-kx} \, dx = -\frac{1}{k} e^{-kx}$$

These render differently. For example, type $\sum_{i=0}^n i^2 = \frac{(n^2+n)(2n+1)}{6}$ to show (which is inline mode) or type $\sum_{i=0}^n i^2 = \frac{(n^2+n)(2n+1)}{6}$ to show

$$\begin{align*} & \phi(x,y) = \phi \left(\sum_{i=1}^n x_ie_i, \sum_{j=1}^n y_je_j \right) = \sum_{i=1}^n \sum_{j=1}^n x_i y_j \phi(e_i, e_j) = \\ & (x_1, \ldots, x_n) \left( \begin{array}{ccc} \phi(e_1, e_1) & \cdots & \phi(e_1, e_n) \\ \vdots & \ddots & \vdots \\ \phi(e_n, e_1) & \cdots & \phi(e_n, e_n) \end{array} \right) \left( \begin{array}{c} y_1 \\ \vdots \\ y_n \end{array} \right) \end{align*}$$