Tables 14.4(a) and (b) make (R, +, ) into a ring, where R = {s, t, x,
Question:
(a) What is the zero for this ring?
(b) What is the additive inverse of each element?
(c) What is t(s + xy)?
(d) Is R a commutative ring?
(e) Does R have a unity?
(f) Find a pair of zero divisors.
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Related Book For 
Discrete and Combinatorial Mathematics An Applied Introduction
ISBN: 978-0201726343
5th edition
Authors: Ralph P. Grimaldi
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