Mathematics and Poetry

Poetry is the art of giving different names to the same thing.
Mathematics is the art of giving the same name to different things.

(attributed in various forms variously to mathematician Henri Poincaré; cf. No Concepts At All (22 Feb 2001), LogicAndInformation (1 Aug 2001), MillenniumMath (2002-12-05), GatewaysToMathematics (2004-05-20), CircleSquaring (2005-07-25), MathAndSex (2007-09-18), ...) - ^z - 2008-11-09