TestMath

$E=mc^{2}$

$A=\int _{0}^{1}{\frac {\ln {x}}{x}}\,\mathrm {d} x$

Failed to parse (unknown function "\begin{equation}"): {\displaystyle \begin{equation} \begin{split} a& =b+c-d\\ & \quad +e-f\\ & =g+h\\ & =i \end{split} \end{equation} }