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- In Example 3, the group S(A) is nonabelian where A={ 1,2,3 }. Exhibit a set A such that S(A) is abelian. Example 3. We shall take A={ 1,2,3 } and obtain an explicit example of S(A). In order to define an element f of S(A), we need to specify f(1), f(2), and f(3). There are three possible choices for f(1). Since f is to be bijective, there are two choices for f(2) after f(1) has been designated, and then only once choice for f(3). Hence there are 3!=321 different mappings f in S(A).Exercises 18. Suppose and let be defined by . Prove or disprove that is an automorphism of the additive group .Write 20 as the direct sum of two of its nontrivial subgroups.
- 25. Figure 6.3 gives addition and multiplication tables for the ring in Exercise 34 of section 5.1. Use these tables, together with addition and multiplication tables for to find an isomorphism from toProve 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.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.
- For each a in the group G, define a mapping ta:GG by ta(x)=axa1. Prove that ta is an automorphism of G. Sec. 4.6,32 Let a be a fixed element of the group G. According to Exercise 20 of Section 3.5, the mapping ta:GG defined by ta(x)=axa1 is an automorphism of G. Each of these automorphisms ta is called an inner automorphism of G. Prove that the set Inn(G)=taaG forms a normal subgroup of the group of all automorphisms of G.a.) If we have an epimorphism from G to G’, then we know G must be the same or of bigger order than G’. (Can you explain why?) b.) If G and G’ are of the same order, it’s pretty easy to get the isomorphism. (Again, can you explain why?) c.) If the order of G is larger than the order of G’ AND the operation is maintained by this mapping, where do all of the “extra” elements in G have to be mapping?Problem 5. Let m, n be positive integers.(1) Find all homomorphisms from Zn to Zm.(2) Prove that a homomorphism from Zn to Zm is an isomorphism if and only if m = n.(3) How many isomorphisms from Zn to Zn?
- Let G ={[1 0 0 1] ,[−1 0 0 1] ,[1 0 0 −1], [−1 0 0 −1]} . Is G ∼= K4? If yes, givean explicit isomorphism?Hello, can you help me out with this problem? Please write a solution on a piece of paper and upload it here. Question: Let G1 = ℤ3 , G2 = ℤ4, and G3 = ℤ2 1. What is |(2,2,1)|-1 in G1⨁G2⨁G3 2. Find an isomorphism from G1⨁G3 to ℤ6Consider maps π1 : G1 × G2 → G1 given by π1(g1, g2) = g1 and π2 : G1 × G2 → G2 given byπ2(g1, g2) = g2. Show that π1 and π2 are homomorphisms (You can just show one of them is a homomorphism and say the other one follows similarly.)