$$\sum_{i = 0}^{\infty} \frac{1}{i^2} = \frac{\pi^2}{6}​$$

Here we define a function def fac(n).

Single line mathjax $a[x][?]$, $b_i * a[x][?]$ .

This will be error : $a * b * c * d$.

You must use $a \times b \times c \times d$ or $a \cdot b\cdot c\cdot d$.

This is because in markdown * will be treated as ‘emphy’.

\begin{align} F_{i, j} = & a_1 + a_2 \ & a_3 + a_4 \ \end{align}​

$$A = \begin{bmatrix} \vec{a_1} \vec{a_2} \ldots \vec{a_n}\end{bmatrix}​$$

Test.

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