3. Prove that a subset H of a finite group G is a subgroup of G if and only if a. His nonempty, and b. a E H and b E H imply ab e H.
3. Prove that a subset H of a finite group G is a subgroup of G if and only if a. His nonempty, and b. a E H and b E H imply ab e H.
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 23E: 23. Prove that if and are normal subgroups of such that , then for all
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