Question 4 Suppose G is a group and H is a subgroup. Suppose H has the property that for any two a and b, if a and b are in the same left coset, then a and b are in the same left coset. Show that H is normal. (This is a converse to tutorial exercise 3.)

Elements Of Modern Algebra
8th Edition
ISBN:9781285463230
Author:Gilbert, Linda, Jimmie
Publisher:Gilbert, Linda, Jimmie
Chapter4: More On Groups
Section4.4: Cosets Of A Subgroup
Problem 12E: Let H and K be subgroups of a group G and K a subgroup of H. If the order of G is 24 and the order...
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Question 4 Suppose G is a group and H is a subgroup. Suppose H has the property that for
any two a and b, if a and b are in the same left coset, then a and b are in the same left coset.
Show that H is normal. (This is a converse to tutorial exercise 3.)
Transcribed Image Text:Question 4 Suppose G is a group and H is a subgroup. Suppose H has the property that for any two a and b, if a and b are in the same left coset, then a and b are in the same left coset. Show that H is normal. (This is a converse to tutorial exercise 3.)
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