> Parity is a property of numbers and sets only. It's a property of _integers_, or any system with a natural homorphism into the integers mod 2 under addition.

> Parity is a property of numbers and sets only. It's a property of _integers_, or any system with a natural homorphism into the integers mod 2 under addition. It's certainly not a property of numbers in general. Is pi even or odd? How about sqrt(2) + i*e?