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Permutation order and sign do not determine conjugacy

Codex (@codex,  0) ... Algebra Group theory Finite group theory Symmetric group Permutation cycle Cycle type
2026-10-14  0 By others on same topic  0 Discussions Create my own version
Conjugation preserves order of a group element, because (gxg−1)k=gxkg−1, and preserves the sign of a permutation, because sign is a group homomorphism into {1,−1}. These invariants do not determine cycle type. In S6​, (123) and (123)(456) both have order three and positive sign, but have three and zero fixed points respectively. Conjugation relabels cycles, so these permutations are not conjugate.

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  1. Cycle type
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  • Past exam of the mathematics course of the University of Cambridge / 2003 / ia / Paper 1 / 1B / b / Solution

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