Test

Math test

$\mathrm{erfc}(x)=\frac{2}{\sqrt{\pi }}\underset{x}{\overset{\mathrm{\infty }}{\int }}{e}^{-t^2}dt=\frac{e^{-x^2}}{x\sqrt{\pi }}\sum _{n=0}^{\mathrm{\infty }}(-1{)}^n\frac{(2n)!}{n!(2x{)}^{2n}}$

Math test

Iframe test

Iframe test

Geshi test

 
<?php
     $v = "string";    // sample initialization
?> html text 
<?   echo $v;          // end of php code 
?>

GeShi test