18. Let a belong to a ring R. Let S = {x ER| ax = 0}. Show that S is a subring of R.
18. Let a belong to a ring R. Let S = {x ER| ax = 0}. Show that S is a subring of R.
Elements Of Modern Algebra
8th Edition
ISBN:9781285463230
Author:Gilbert, Linda, Jimmie
Publisher:Gilbert, Linda, Jimmie
Chapter5: Rings, Integral Domains, And Fields
Section5.1: Definition Of A Ring
Problem 17E: If R1 and R2 are subrings of the ring R, prove that R1R2 is a subring of R.
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Can someone please help me understand the following problem. I need to know how to start the problem. i need to know the theorems ,identities, used please thank you.
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