Let H = {β ∈ S5 : β(4) = 4}. Prove that H is a subgroup of S5. (Reminder: The group operation of S5 is composition of functions, and it’s helpful here to use the definition (αβ)(n) = α(β(n)).)

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 5E: 5. For any subgroup of the group , let denote the product as defined in Definition 4.10. Prove that...
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Let H = {β ∈ S5 : β(4) = 4}. Prove that H is a subgroup of S5.

(Reminder: The group operation of S5 is composition of functions, and it’s helpful here to use the definition (αβ)(n) = α(β(n)).)

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