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(I think it's not associative so it cannot be a ring but I'm not sure whether that's correct). Thank you very much for the help!!
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- Examples 5 and 6 of Section 5.1 showed that P(U) is a commutative ring with unity. In Exercises 4 and 5, let U={a,b}. Is P(U) a field? If not, find all nonzero elements that do not have multiplicative inverses. [Type here][Type here]15. Let and be elements of a ring. Prove that the equation has a unique solution.Let ω be a nonreal complex number such that ω5 = 1. If Φis theautomorphismof Q(ω) that carries ω to ω4, find the fixed field of <Φ>.
- The set of Gaussian integers Z[i]={m+ni:m,n∈Z} together with addition + and multiplication ⋅ of complex numbers, and i=−1−−−√ constitute a commutative ring with zero 0+0i and unity e=1+0i. It is also an ordered integral domain. True FalseLet R be a ring.(a) Show that R has exactly one zero, 0R.(b) If R also has an identity, 1R, show that 1R is the only identity.(c) Can a unit in R have more than one inverse? If yes, give an example. If no, prove it.Question#1:Let R be a commutative ring with unit element .if f(x) is a prime ideal of R[x] then show that R is an integral domain. Question#2:show that the units in a commutative ring with unit element forms an abelian group w.r.t multiplication.
- 1. Let R be a commutative ring with unity 1 and I is an ideal in R. Then what is the unity in the ring R/I?2. What is the degree of f=(20x+1)(5x+1) in ℤ_5[x]? Type only the numerical value if it is defined if not type undefined.Prove:1. If the multiplicative axiom of a field implies that if x ≠ 0, then (1/(1/x)) = x2. ∀R x>0 and ∀Z n > 0, there is exactly one positive real y such that yn=x.1. Prove: The square of any integer n is of the form 3k or of the form 3k+1 for some integer k. 2. Let a be an element of a ring R such that a3=1R. Prove: for any integer n, either (an)n=1R or (an)n=a.