2. Assume the group G acts on the set S. For E S, define Then G is a subgroup of G , which is called the stabilizer of r. The set is called the orbit of r (a) Consider the map ф' G S, defined by фг (g) :-9-x. Prove that there is one map (and only one) : G/G, S such that Vz ยู่'z q (where q: G -G/G, is the quotient map). (b) Prove that is injective. (Hint:...
the following questions are relative,please solve them, thanks! 4. Let G be a group. An isomorphism : G G is called an automorphism of G. (a) Prove that the set, Aut(G), of all automorphisms of G forms a group under composition. (b) Let g E G. Show that the map ф9: G-+ G given by c%(z)-gZg", įs an automorphism. These are called the inner automorphisms of G (c) Show that the set of all g E G such that Og-Pe...
(i) Determine whether φ defines a homomorphism. (ii) Find ker ф :-(g E G I ф(G)-e) and inn ф d(G). (ii) Draw Cayley diagrams of the domain and codomain, and arrange them so one can "visually see" the cosets of ker φ in G. Draw dotted lines around these cosets. (iv) Is the quotient G/ker ф a group? If so, what is it isomorphic to? Here is an example of Step (iii) for the map o: Z6 Z3, defined by...
(i) Determine whether ф defines a hornom Orphism. (ii) Find ker ф :-0€ G | ф(G) e} and in ф ф(G). (ii) Draw Cayley diagrams of the domain and codomain, and arrange them so one can "visually see" the cosets of ker ф in G. Draw dotted lines around these cosets. (iv) Is the quotient G/kero a group? If so, what is it isomorphic to? Z, defined by ф(n) n (mod 3). Here is an example of Step (iii) for...
Exercise 2. Let he a group anith nentral element e. We denote the gronp lau on G simply by (91,92)gig2. Let X be a set. An action ofG on X is a a map that satisfies the following tuo conditions: c. Let G be a finite group. For each E X, consider the map (aje- fer all elements r X (b) 9-(92-2) for all 91,92 G and all r E X Show that is surjective and that, for all y...
(6) The center of a group G is the set ZG) = {x EG: zg = gx for all g € G}. Thus, x E Z(G) if x commutes with element of G. Prove that Z(G) is a subgroup of G. (7) An automorphism of a group G is an isomorphism from G to G. Let G be a group and let x E G. Prove that the function 4x: G + G defined by 4x(g) = xgx for all...
2. The center of a group G is the set (a) Prove that Z(G) is a subgroup of G, and that it is normal in G (b) Compute the center of the following groups: GG, Di D, Qs, At, Sa, and Dax Qs 2. The center of a group G is the set (a) Prove that Z(G) is a subgroup of G, and that it is normal in G (b) Compute the center of the following groups: GG, Di D,...
Q16 S CX}. If G has a group 15. The powerset of a set, X, is defined to be the collection of all subsets of X: P(X) = { S action on X, then the group action can be defined on P(X) by a. S = {a.s | SES}. (a) Show that if S = orb(r), then a.S= S for all a E G. (b) If a. S = S, show that S = U; orb(r) for some elements r;...
Abstract Algebra Ring Question. see the image and show parts a, b, c, and d please. 36. Let R be a ring with identity. (a) Let u be a unit in R. Define a map ix : R R by Huru". Prove that i, is an automorphism of R. Such an automorphism of R is called an inner automorphism of R. Denote the set of all inner automorphisms of R by Inn(R). (b) Denote the set of all automorphisms of...
Question 4 Exercise 1. Let G be a group such that |G| is even. Show that there exists an EG,17e with x = e. Exercise 2. Let G be a group and H a subgroup of G. Define a set K by K = {z € G war- € H for all a € H}. Show that (i) K <G (ii) H <K Exercise 3. Let S be the set R\ {0,1}. Define functions from S to S by e(z)...