Math Formula on Wiki

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Use this website for formula 
  \operatorname{erfc}(x) =
  \frac{2}{\sqrt{\pi}} \int_x^{\infty} e^{-t^2}\,dt =
  \frac{e^{-x^2}}{x\sqrt{\pi}}\sum_{n=0}^\infty (-1)^n \frac{(2n)!}{n!(2x)^{2n}}



{\pi}r^2 4{\pi}{\epsilon}r^2

How to write a matrix:

<math> \begin{matrix} a & b \\ d & e \end{matrix}</math>

The & sign separates columns and the "\\" separates the rows

  a & b  \\
  d & e  


Chemical formula: Sulphuric Acid - H_2SO_4

\bar a


\exists \partial


\sqrt{45} \sum_ x \frac{\sum {x}}{n}={\bar x}