Cauchy's Inequality/Also presented as

Cauchy's Inequality: Also presented as
Cauchy's Inequality can also be expressed in the form:
 * $\ds \sum_{i \mathop = 1}^n r_i s_i \le \sqrt {\paren {\sum_{i \mathop = 1}^n r_i} \paren {\sum_{i \mathop = 1}^n s_i} }$

where all of $r_i, s_i \in \R$.