6. Let G be a group and H a subgroup of G. Let a E G be an element Define aHa-1 = {aha-1|h E H}. A. Show that aHa-1 is also a subgroup of G. B. Suppose o(H)= n, what can you say about the order of o(aHa-1)?

Elements Of Modern Algebra
8th Edition
ISBN:9781285463230
Author:Gilbert, Linda, Jimmie
Publisher:Gilbert, Linda, Jimmie
Chapter4: More On Groups
Section4.5: Normal Subgroups
Problem 15E: Find groups H and K such that the following conditions are satisfied: H is a normal subgroup of K. K...
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6. Let G be a group and H a subgroup of G. Let a E G be an element Define aHa-1 =
{aha-1|h E H}.
A. Show that aHa-1 is also a subgroup of G.
B. Suppose o(H)= n, what can you say about the order of o(aHa-1)?
7. Let G be a group and a E G. The centralizer C(a) of a in G is define as
C (a) xE G | χα αx)
that is C(a) is the set of all elements in G which commutes with a. Show that C(a) is a subgroup of
G.
Transcribed Image Text:6. Let G be a group and H a subgroup of G. Let a E G be an element Define aHa-1 = {aha-1|h E H}. A. Show that aHa-1 is also a subgroup of G. B. Suppose o(H)= n, what can you say about the order of o(aHa-1)? 7. Let G be a group and a E G. The centralizer C(a) of a in G is define as C (a) xE G | χα αx) that is C(a) is the set of all elements in G which commutes with a. Show that C(a) is a subgroup of G.
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