Let me make a test
This is an inline math :\sum_{i=1}^nx_iy_i\leq\sqrt{\sum_{i=1}^nx_i}\sqrt{\sum_{i=1}^n y_i}
This is in display math: \sum_{i=1}^nx_iy_i\leq\sqrt{\sum_{i=1}^nx_i}\sqrt{\sum_{i=1}^n y_i}
New line
\sum_{i=1}^nx_iy_i\leq\sqrt{\sum_{i=1}^nx_i}\sqrt{\sum_{i=1}^n y_i}
\begin{tabular}{c|c|c}a&b&c\\d&e&f\end{tabular}
