Question: Exercise 1. Let f : R - S be a ring homomorphism. Let B be a subring of S and put A:= {rER|f(r) & B}.

Exercise 1. Let f : R - S be a ring

Exercise 1. Let f : R - S be a ring homomorphism. Let B be a subring of S and put A:= {rER|f(r) & B}. Show that A is a subring of R

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