\[x = y^2\]

This sentence uses $ delimiters to show math inline: $\sqrt{3x-1}+(1+x)^2$

The Cauchy-Schwarz Inequality \(\left( \sum_{k=1}^n a_k b_k \right)^2 \leq \left( \sum_{k=1}^n a_k^2 \right) \left( \sum_{k=1}^n b_k^2 \right)\)

Alternatively, you can use the ```math code block syntax to display a math expression as a block. With this syntax, you don’t need to use $$ delimiters. The following will render the same as above:

The Cauchy-Schwarz Inequality

\left( \sum_{k=1}^n a_k b_k \right)^2 \leq \left( \sum_{k=1}^n a_k^2 \right) \left( \sum_{k=1}^n b_k^2 \right)