In belated recognition of April being Math Awareness Month, my column this May will deal with parity.
The notion refers to the evenness or oddness of a number, say April the fourth month versus May the fifth. Despite its simplicity parity plays an important role in many areas of mathematics.
It also lends itself to some nice little puzzles, including Rubik's cube and the 15 puzzle. Here are five or six easy examples. The sixth one is fuzzy and involves politics and the Supreme Court, so it...Full Story