Q5. G be a finite group and let N be a normal subgroup of G. Suppose that the order n of N is relatively prime to the index |G:N=m. (a) Prove that N={a€G|a"=e} (b) Prove that N={b"|bEG}
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Q: 8. Find a non-trivial normal subgroup of the octic group. Demonstrate that this subgroup is normal.
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A: Since 0 does not divides 12.
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A: To prove that no subgroup of order 2 in the symmetric group Sn (n >2) is normal.
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Q: Suppose H and K are subgroups of a group G. If |H| = 12 and |K| = 35, find |H N K|. Generalize. %3D
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Gbe a finite group and letNbe a normal subgroup ofG.Suppose that the ordernofNis relatively prime to the index|G:N|=m.(a)Prove thatN={a∈G∣an=e}(b)Prove thatN={bm∣b∈
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- 27. Suppose is a normal subgroup of order of a group . Prove that is contained in , the center of .With H and K as in Exercise 18, prove that K is a normal subgroup of HK. Exercise18: If H is a subgroup of G, and K is a normal subgroup of G, prove that HK=KH.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, then
- Let be a group of order 24. If is a subgroup of , what are all the possible orders 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?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.
- 18. If is a subgroup of , and is a normal subgroup of , prove that .14. 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.)Find the normalizer of the subgroup (1),(1,3)(2,4) of the octic group D4.
- Find groups H and K such that the following conditions are satisfied: H is a normal subgroup of K. K is a normal subgroup of the octic group. H is not a normal subgroup of the octic group.For each of the following subgroups H of the addition groups Z18, find the distinct left cosets of H in Z18, partition Z18 into left cosets of H, and state the index [ Z18:H ] of H in Z18. H= [ 8 ] .4. Prove that the special linear group is a normal subgroup of the general linear group .