@pickover Complex plane requires updating one's perception. Sides of triangle do not represent direction, but magnitude, since using 'i' as side length is like using a Vector to denote triangle side. Pythagoras strictly considers magnitude, so think of 'i' 's magnitude=1 to calculate side
Mathematics.
The Woman, the Finger, and the Triangle: A Math Diagram That Will Make You Question Everything.
Please enjoy this right-triangle for which a² + b² = c².
@pickover As far as I know, ONE was always "Neither Prime, nor Composite" which makes sense since it's actual factorization which never includes Identity numbers. You don't see 0 during additions, right? And you don't see 1 during multiplication as using identities are redundant.