Suppose that A is subset of a group G such that              A = {a : a2 =e  , a in G }    Where e is identity element of G

Elements Of Modern Algebra
8th Edition
ISBN:9781285463230
Author:Gilbert, Linda, Jimmie
Publisher:Gilbert, Linda, Jimmie
Chapter3: Groups
Section3.3: Subgroups
Problem 43E: 43. Suppose that is a nonempty subset of a group . Prove that is a subgroup of if and only if for...
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Suppose that A is subset of a group G such that

             A = {a : a2 =e  , a in G }   

Where e is identity element of G.

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