2. Let G be a group and let H be a subgroup of G. Define N(H) = { x = G | xHx™¹ = H}. Prove that N(H) (called the normalizer of H) is a subgroup of G.*
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- 34. Suppose that and are subgroups of the group . Prove that is a subgroup of .22. If and are both normal subgroups of , prove that is a normal subgroup of .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 of K is 3, what are all the possible orders of H?
- 18. If is a subgroup of , and is a normal subgroup of , prove that .18. If is a subgroup of the group such that for all left cosets and of in, prove that is normal in.Let G be the group and H the subgroup given in each of the following exercises of Section 4.4. In each case, is H normal in G? Exercise 3 b. Exercise 4 c. Exercise 5 d. Exercise 6 e. Exercise 7 f. Exercise 8 Section 4.4 Let H be the subgroup e, of the octic group D4. Find the distinct left cosets of H in D4, write out their elements, partition D4 into left cosets of H, and give [D4:H]. Find the distinct right cosets of H in D4, write out their elements, and partition D4 into right cosets of H. Let H be the subgroup e, of the octic group D4. Find the distinct left cosets of H in D4, write out their elements, partition D4 into left cosets of H, and give [D4:H]. Find the distinct right cosets of H in D4, write out their elements, and partition D4 into right cosets of H. Let H be the subgroup e, of the octic group D4. Find the distinct left cosets of H in D4, write out their elements, partition D4 into left cosets of H, and give [D4:H]. Find the distinct right cosets of H in D4, write out their elements, and partition D4 into right cosets of H. Let H be the subgroup (1),(2,3) of S3. Find the distinct left cosets of H in S3, write out their elements, partition S3 into left cosets of H, and give [S3:H]. Find the distinct right cosets of H in S3, write out their elements, and partition S3 into right cosets of H. In Exercises 7 and 8, let G be the multiplicative group of permutation matrices I3,P3,P32,P1,P4,P2 in Example 6 of Section 3.5 Let H be the subgroup of G given by H=I3,P4={ (100010001),(001010100) }. Find the distinct left cosets of H in G, write out their elements, partition G into left cosets of H, and give [G:H]. Find the distinct right cosets of H in G, write out their elements, and partition G into right cosets of H. Let H be the subgroup of G given by H=I3,P3,P32={ (100010001),(010001100),(001100010) }. Find the distinct left cosets of H in G, write out their elements, partition G into left cosets of H, and give [G:H]. Find the distinct right cosets of H in G, write out their elements, and partition G into right cosets of H.
- Find the normalizer of the subgroup (1),(1,3)(2,4) of the octic group D4.If H and K are arbitrary subgroups of G, prove that HK=KH if and only if HK is a subgroup of G.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 .
- 28. For an arbitrary subgroup of the group , the normalizer of in is the set . a. Prove that is a subgroup of . b. Prove that is a normal subgroup of . c. Prove that if is a subgroup of that contains as a normal subgroup, then14. Find groups and such that and the following conditions are satisfied: a. is a normal subgroup of . b. is a normal subgroup of . c. is not a normal subgroup of . (Thus the statement “A normal subgroup of a normal subgroup is a normal subgroup” is false.)Prove or disprove that H={ [ 1a01 ]|a } is a normal subgroup of the special linear group SL(2,).