Vital few, trivial many

Topics related to research in computing and subjects in general.

Wednesday, August 15, 2012

$\sqrt{(p_1-q_1)^2 + (p_2-q_2)^2 + \cdots + (p_n-q_n)^2} = \sqrt{\sum_{i=1}^n (p_i-q_i)^2}.$