Let be a commutative ring with . Let be an element of . I want to show that is irreducible over if and only if irreducible over .
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Originally Posted by bram kierkels Let be a commutative ring with . Let be an element of . I want to show that is irreducible over if and only if irreducible over . The map is an automorphism of the ring , and then: reducible via the above automorphism reducible . Tonio
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