Proof by Cases
Question Description
Prove by cases:
1) Statement: If ∈ ℤ, then
+ + is an odd integer.
Proof:
2) Statement: If ∈ ℤ, then
− is even.
Prove:
3) Prove the following statement by Proof by Contrapositive, and Proof by Contradiction:
Statement: If − is odd, then + is even
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