Let D be a noetherian integral domain. Show that D is a unique factor ization domain if and only if every irreducible in D is a prime.
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- 6. Prove that if is any element of an ordered integral domain then there exists an element such that . (Thus has no greatest element, and no finite integral domain can be an ordered integral domain.)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]14. a. If is an ordered integral domain, prove that each element in the quotient field of can be written in the form with in . b. If with in , prove that if and only if in .
- 29. Let be the set of Gaussian integers . Let . a. Prove or disprove that is a substring of . b. Prove or disprove that is an ideal of .12. Let be a commutative ring with prime characteristic . Prove, for any in that for every positive integer .Prove that if R is a field, then R has no nontrivial ideals.
- Let D be an integral domain with four elements, D=0,e,a,b, where e is the unity. a. Prove that D has characteristic 2. b. Construct an addition table for D.17. Suppose is a ring with positive characteristic. Prove that if is any ideal of then is a multiple of the characteristic of.24. If is a commutative ring and is a fixed element of prove that the setis an ideal of . (The set is called the annihilator of in the ring .)