1.19. If M and N are normal subgroups of a group G, then G/(MN) is isomorphic to a subgroup of the (external) direct product G/MXG/N.
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- 19. With and as in Exercise 18, prove that is a subgroup of . Exercise18: 18. If is a subgroup of , and is a normal subgroup of , prove that .Prove or disprove that H={ [ 1a01 ]|a } is a normal subgroup of the special linear group SL(2,).Label each of the following statements as either true or false. The Cayley table for a group will always be symmetric with respect to the diagonal from upper left to lower right.
- 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.39. Assume that and are subgroups of the abelian group. Prove that the set of products is a subgroup of.Label each of the following statements as either true or false. Two groups can be isomorphic even though their group operations are different.