Let H be as in Exercise 3. Use Exercise 4 to decide whether or not the following cosets of H are the same.
a. 11 + H and 17 + H
b. 21 + H and 5 + H
c. 7 + H and 23 + H
Reference:
3. Let H = {0, ±3, ±6, ±9, . . .}. Find all the left cosets of H in Z.
4. Rewrite the condition a–1b ∈ H given in property 5 of the lemma on page 145 in additive notation. Assume that the group is Abelian.
Reference:
Lemma Properties of Cosets
Let H be a subgroup of G, and let a and b belong to G. Then,
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