Exercise 7.4. Let N₁ and №2 be normal subgroups of groups G₁ and G2, respectively. Show that N₁N2 is a normal subgroup of G₁ ×G2 and (G1×G2)/(N₁×N2) is isomorphic to (G₁/N₁)×(G2/N2).
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- 12. Find all normal subgroups of the quaternion group.Suppose G1 and G2 are groups with normal subgroups H1 and H2, respectively, and with G1/H1 isomorphic to G2/H2. Determine the possible orders of H1 and H2 under the following conditions. a. G1=24 and G2=18 b. G1=32 and G2=4022. If and are both normal subgroups of , prove that is a normal subgroup 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.Exercises 3. Find an isomorphism from the additive group to the multiplicative group of units . Sec. 16. For an integer , let , the group of units in – that is, the set of all in that have multiplicative inverses, Prove that is a group with respect to multiplication.2. Show that is a normal subgroup of the multiplicative group of invertible matrices in .