prove-that-i-1-n-x-i-y-i-i-1-n-x-i-2-1-2-i-1-n-y-i-2-1-2-x-i-and-y-i-reals-0-

Question Number 94654 by msup by abdo last updated on 20/May/20

p r o v e t h a t \sum_{i = 1}^{n} x_{i} y_{i} ⩽ {(\sum_{i = 1}^{n} x_{i}^{2})}^{\frac{1}{2}} {(\sum_{i = 1}^{n} y_{i}^{2})}^{\frac{1}{2}}

x_{i} a n d y_{i} r e a l s ⩾ 0