Question 9. (a) Prove that every element of Q/Z has finite order.
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Q: 2. Calculate the centroid of the thin plate R which bounded by r= 1, y = 0 and, a² + y² = 4. ccc
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- Prove part c of Theorem 3.4. Theorem 3.4: Properties of Group Elements Let G be a group with respect to a binary operation that is written as multiplication. The identity element e in G is unique. For each xG, the inverse x1 in G is unique. For each xG,(x1)1=x. Reverse order law: For any x and y in G, (xy)1=y1x1. Cancellation laws: If a,x, and y are in G, then either of the equations ax=ay or xa=ya implies that x=y.5. For any subgroup of the group , let denote the product as defined in Definition 4.10. Prove that corollary 4.19:Find two groups of order 6 that are not isomorphic.
- 1.Prove part of Theorem . Theorem 3.4: Properties of Group Elements Let be a group with respect to a binary operation that is written as multiplication. The identity element in is unique. For each, the inverse in is unique. For each . Reverse order law: For any and in ,. Cancellation laws: If and are in , then either of the equations or implies that .Prove or disprove that H={ hGh1=h } is a subgroup of the group G if G is abelian.If p1,p2,...,pr are distinct primes, prove that any two abelian groups that have order n=p1p2...pr are isomorphic.
- Exercises 30. For an arbitrary positive integer, prove that any two cyclic groups of order are isomorphic.27. a. Show that a cyclic group of order has a cyclic group of order as a homomorphic image. b. Show that a cyclic group of order has a cyclic group of order as a homomorphic image.Exercises 31. Let be a group with its center: . Prove that if is the only element of order in , then .