Homework Statement
Prove that |x'y| <= ||x|| ||y|| for vectors x, y
Homework Equations
||x|| is the norm of x
x' is the transpose of x
The Attempt at a Solution
||(x/||x||)-(y/||y||)|| = [ (x'/||x|| - y'/||y||)(x/||x|| - y/||y||) ]^1/2 = [-1/(||x||*||y||) (x'y + y'x) +2]^1/2
we...