Hi
Welcome to Ben’s note. The purpose of this website is to write down some fun math facts.
Hope you enjoy them :)
Inner Product and Cauchy Schwarz
This document starts with the definition of inner product, and contains several problems, after doing them, Cauchy-Schwarz inequality is proved. ...
[Ross] 4 Squares
In this article, we use the Minkowski theorem to prove every positive integer can be written in the form a^2+b^2+c^2+d^2. ...