Let ZxZ→ Z defined by (a, b) = a - b. (a) Show that is a homomorphism. (b) Compute Ker and +(2xz) (c) Using FIT, to what known group is (Z x Z)/Ker o isomorphic to?
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- 15. Prove that if for all in the group , then is abelian.13. Assume that are subgroups of the abelian group . Prove that if and only if is generated byFind the right regular representation of G as defined Exercise 11 for each of the following groups. a. G={ 1,i,1,i } from Example 1. b. The octic group D4={ e,,2,3,,,, }.
- Let a and b be elements of a group G. Prove that G is abelian if and only if (ab)2=a2b2.Exercises 30. For an arbitrary positive integer, prove that any two cyclic groups of order are isomorphic.Prove that the Cartesian product 24 is an abelian group with respect to the binary operation of addition as defined in Example 11. (Sec. 3.4,27b, Sec. 5.1,53,) Example 11. Consider the additive groups 2 and 4. To avoid any unnecessary confusion we write [ a ]2 and [ a ]4 to designate elements in 2 and 4, respectively. The Cartesian product of 2 and 4 can be expressed as 24={ ([ a ]2,[ b ]4)[ a ]22,[ b ]44 } Sec. 3.4,27b 27. Prove or disprove that each of the following groups with addition as defined in Exercises 52 of section 3.1 is cyclic. a. 23 b. 24 Sec. 5.1,53 53. Rework Exercise 52 with the direct sum 24.