Prove that: a) b) c) thanks!!!

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Originally Posted by roporte Prove that: a) b) c) thanks!!! what does mean?

are all R-module homomorphisms from A to B. thanks!

Originally Posted by roporte Prove that: a) the natural homomorphism defined by is obviously nonzero. b) let then: thus: why? hence: c) let then for any integer n > 0: so all (positive) integers are divisors of the integer f(1), which is possible only if f(1) = 0. therefore: why?

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