Let R be the ring of all continuous real valued functions on the closed interval [0, 1]. Prove that the map : R→→→→R defined by Þ(f) = f* f(t)dt is a homomorphism of additve groups but NOT a ring homomorphism
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- Prove that if a subring R of an integral domain D contains the unity element of D, then R is an integral domain. [Type here][Type here]Prove Theorem If and are relatively prime polynomials over the field and if in , then in .Describe the kernel of epimorphism in Exercise 22. Assume that each of R and S is a commutative ring with unity and that :RS is an epimorphism from R to S. Let :R[ x ]S[ x ] be defined by, (a0+a1x++anxn)=(a0)+(a1)x++(an)xn.
- Consider the mapping :Z[ x ]Zk[ x ] defined by (a0+a1x++anxn)=[ a0 ]+[ a1 ]x++[ an ]xn, where [ ai ] denotes the congruence class of Zk that contains ai. Prove that is an epimorphism from Z[ x ] to Zk[ x ].Prove that a polynomial f(x) of positive degree n over the field F has at most n (not necessarily distinct) zeros in F.Let be a field. Prove that if is a zero of then is a zero of
- 11. Show that defined by is not a homomorphism.Describe the kernel of epimorphism in Exercise 20. Consider the mapping :Z[ x ]Zk[ x ] defined by (a0+a1x++anxn)=[ a0 ]+[ a1 ]x++[ an ]xn, where [ ai ] denotes the congruence class of Zk that contains ai. Prove that is an epimorphism from Z[ x ] to Zk[ x ].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.
- Let :312 be defined by ([x]3)=4[x]12 using the same notational convention as in Exercise 9. Prove that is a ring homomorphism. Is (e)=e where e is the unity in 3 and e is the unity in 12?Let R be a commutative ring with characteristic 2. Show that each of the following is true for all x,yR a. (x+y)2=x2+y2 b. (x+y)4=x4+y414. Let be a ring with unity . Verify that the mapping defined by is a homomorphism.