Homework Statement
For any integer n, let A(n) be the statement:
“If n 2 = 4k + 1 for some k ∈ Z, then n = 4q + 1 or 4q + 3 for some q ∈ Z.”
Use proof by contradiction to show that A(n) is true for all n ∈ Z.
The Attempt at a Solution
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the answer sheet says that since n !=4q+1 and n !=...
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0. Background
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