#AtoZChallenge2015: Orthogonal

The word orthogonal conjures up memories of wonderful maths classes, many years ago, as well as more obscure readings, much later, of absconse topological subjects. Geometry was one of the great pleasures of my youth: yes, we are all different! I quote from: Barile, Margherita. "Orthogonal." From MathWorld--A Wolfram Web Resource, created by Eric W. Weisstein. http://mathworld.wolfram.com/Orthogonal.html "In elementary … Continue reading #AtoZChallenge2015: Orthogonal