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- Show that every subgroup of an abelian group is normal.Find all subgroups of the quaternion group.Exercise 8 states that every subgroup of an abelian group is normal. Give an example of a nonabelian group for which every subgroup is normal. Exercise 8: Show that every subgroup of an abelian group is normal.
- Q,+ ,+,*) is not a proper subgroup of R+ under multiplication? T or FIf H and K are normal subgroups of G, show that their intersection is also a normal subgroup. To do this, let b be an element of the intersection, so b is in H and b is in K. Then what can we say about gbg^{-1} because b is in the normal subgroup K? What can we say about b, because b is in the normal subgroup H? Why then is gbg^{-1} in the intersection of H and K?Find all inclusion between subgroups in Z/48Z
- If G = {1, 2, 3, 4, 5, 6} is the upper group of multiplication modulo 7, H is a subgroup of G with H = {1, 2, 4} a. Find all right cosets in G b. And also determine the index!Suppose that H is a subgroup of Z under addition and that H contains250 and 350. What are the possibilities for H?Prove that If |G|=np with p>n and p prime, and H is a subgroup of G with order p, then: H is normal in G. Please be as clear as possible showing and explaining all the steps, and use definitions if necessary. Thank you very much.