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10 Nov 2019
Q16. Let f : R â S be a ring homomorphism. Let I be the subset of R consisting of those elements x e R such that f(x) 0-0s. Prove thatãis an ideal of R. (Note. This ideal is called the kernel of f, and is written as ker(f).)
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Sixta Kovacek
Lv2
6 Feb 2019
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