Let G be a group and a an element of G. the centralizer of a is the set C(a)={g in G: ga=ag}. prove that C(a) is a subgroup of G.

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- Mar 24th 2010, 08:40 AMnikie1o2Prove C(a) is a subgroup of G
Let G be a group and a an element of G. the centralizer of a is the set C(a)={g in G: ga=ag}. prove that C(a) is a subgroup of G.

- Mar 24th 2010, 09:18 AMtonio
- Mar 24th 2010, 09:20 AMhatsoff