R_{\mu \nu} - {1 \over 2}g_{\mu \nu}\,R + g_{\mu \nu} \Lambda = {8 \pi G \over c^4} T_{\mu \nu}

X(m,n)= \begin{cases} x(n)\\ x(n-1)\\ x(n-1) \end{cases}

e^{lim(x \text{ln}(1+\frac{1}{x}))} = e^{lim(\frac{ln(1+\frac{1}{x}}{x-1})}

\texttt{Hello World}