Exercise 6.5. Let G be a group and let S := {abab | a, b G}. The commutator subgroup of G is the subgroup C generated by S, i.e. C = Ɑ H. (1) Show that C is a normal subgroup of G. H:H

Elements Of Modern Algebra
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Author:Gilbert, Linda, Jimmie
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Chapter4: More On Groups
Section4.5: Normal Subgroups
Problem 20E
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Exercise 6.5. Let G be a group and let S := {abab | a, b G}. The commutator subgroup of
G is the subgroup C generated by S, i.e.
C =
Ɑ H.
(1) Show that C is a normal subgroup of G.
H:H<G
SCH
(2) Suppose G GL (R). Show that SL (R)(= {g Є GL, (R) | det(g) 1}) contains the
commutator subgroup of GLn (R).
(In fact, SL (R) is the commutator subgroup of GL, (R).)
Transcribed Image Text:Exercise 6.5. Let G be a group and let S := {abab | a, b G}. The commutator subgroup of G is the subgroup C generated by S, i.e. C = Ɑ H. (1) Show that C is a normal subgroup of G. H:H<G SCH (2) Suppose G GL (R). Show that SL (R)(= {g Є GL, (R) | det(g) 1}) contains the commutator subgroup of GLn (R). (In fact, SL (R) is the commutator subgroup of GL, (R).)
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