Cauchy-Bunyakovsky-Schwarz Inequality

Cauchy's Inequality
The special case of the Cauchy-Bunyakovsky-Schwarz Inequality in a Euclidean space is called Cauchy's Inequality. It was Cauchy who first published this result in 1821.

It is usually stated as:

Also known as
This theorem is also known as the Cauchy-Schwarz Inequality.