Consider the ring homomorphism : I→ R defined as (a) Show that is a ring homomorphism. (b) Use FIT for rings to show that I/JR as rings. y × ( [ ; ² ]) = - y =x-Y.
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- 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?Consider the ring F(R) of all functions R --> R. I must find a zero divisor in F(R). R represents real numbersLet I = {[xx, y = R} and J = {[²] 1z € R} E Consider the ring homomorphism : I→ R defined as (a) Show that is a ring homomorphism. (b) Use FIT for rings to show that I/JR as rings. ([*]) = x - y.
- Let A and B be rings. Define addition and multiplication on the Cartesian product A x B by (x,y) + (x', y') = (x + x', y + y') and (x, y)(x', y') = (xx', yy'). Show that the A x B is also a ring. When is A x B commutative? When is it a ring with unity? Deduce from these facts that Z₂ x Z3 is a commutative ring with unity write down its addition and multiplication tables.If is a homomorphism from the ring R to the ring R' , show that; a) (0)=0 b) (−r)= −(r)for all rR11. Let R and R' be two rings. A mapping f: R→R' is called an antihomomorphism, if f(x+y)=f(x) + f(y) and f(xy) = f(y)f(x) x, y € R. Let f, g be two antihomomorphisms of a ring R into R. Prove that fg: R R is a homomorphism.
- B E None (i), (ii) (iii), (iv) Which of the following are ring homomorphisms? (i): f: (Q(√2), +,-) → (Q(√3), +,-), a +b√2+a+b√3. (ii): f: C Rx R, a +bi (a, b). (iii): f: (QxQ, +,-) → (Q(√2), +,-), (x,y) →x+yv2. (iv): f: CR, a +bi+ a² + b². ...Prove that 2/3Z = Z, as rings.In the frieze group F7, show that zxz = x-1.