I need help with the following proof

Prove: If each of m and n is an integer, then m+n and m-n are both even if m and n are both even or both odd.

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- Mar 1st 2009, 10:35 AMnoles2188Integer Proof
I need help with the following proof

Prove: If each of m and n is an integer, then m+n and m-n are both even if m and n are both even or both odd. - Mar 1st 2009, 11:09 AMGaloisTheory1