1. [tex] \forall m,n \in Z, if m + n is even then either m and n are both even or
they are both odd [\math]
2. Prove or disprove using contradiction. Every integer > 11 is the sum of two
For the first number, is it the same if I prove that if m and n are both even then m +n is even and if m and n are both odd then m + n is even?