The number of centralizers of a finite group. Let G be a finite group. A subgroup of G may be the centralizer of an element of G. Count the number of such subgroups of G, and call the answer #Cent (G) (a) Show that G is abelian if and only if #Cent(G) = 1. %3D

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The number of centralizers of a finite group. Let G be a finite
group. A subgroup of G may be the centralizer of an element of G. Count
the number of such subgroups of G, and call the answer #Cent (G)
(a) Show that G is abelian if and only if #Cent (G) = 1.
(b) Show that any non-abelian group G is the union of its proper cen-
tralizers.
(c) Show that #Cent(G) # 2.
(d) Show that #Cent(G) # 3.
(e) What is #Cent(D8)?
Transcribed Image Text:The number of centralizers of a finite group. Let G be a finite group. A subgroup of G may be the centralizer of an element of G. Count the number of such subgroups of G, and call the answer #Cent (G) (a) Show that G is abelian if and only if #Cent (G) = 1. (b) Show that any non-abelian group G is the union of its proper cen- tralizers. (c) Show that #Cent(G) # 2. (d) Show that #Cent(G) # 3. (e) What is #Cent(D8)?
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