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If is even, prove that –1 is even. If a is odd, prove that

Chapter 5, Problem 16E

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QUESTION:

If \(\alpha\) is even, prove that \(\alpha^{-1}\) is even. If \(\alpha\) is odd, prove that \(\alpha^{-1}\) is odd.

Questions & Answers

QUESTION:

If \(\alpha\) is even, prove that \(\alpha^{-1}\) is even. If \(\alpha\) is odd, prove that \(\alpha^{-1}\) is odd.

ANSWER:

Step 1 of 2

Let us consider that be a permutation with its inverse permutation .

Then,

, being the identity permutation.

We know that every permutation can be expressed as the composition of 2-cycles and the number of 2-cycles in composition of permutations is of the same parity as the sum of the number of 2-cycles in each permutation.  

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