implies y = z. Prove that G is Abelian. Prove that a group G is Abelian if and only if (gh)-1 = g¬ Prove that in a group, (g-1)-1 = g for all g. %3D
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In part I. Answer no. 4 ,and part II answer no. 1 and 2
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- 11. Assume that are subgroups of the abelian group such that the sum is direct. If is a subgroup of for prove that is a direct sum.If p1,p2,...,pr are distinct primes, prove that any two abelian groups that have order n=p1p2...pr are isomorphic.15. Prove that if for all in the group , then is abelian.
- Let G be a group and Z(G) its center. Prove or disprove that if ab is in Z(G), then ab=ba.14. Let be an abelian group of order where and are relatively prime. If and , prove that .Prove that each of the following subsets H of GL(2,C) is subgroup of the group GL(2,C), the general linear group of order 2 over C a. H={ [ 1001 ],[ 1001 ],[ 1001 ],[ 1001 ] } b. H={ [ 1001 ],[ i00i ],[ i00i ],[ 1001 ] }