Q20: a. Give an example for a commutative ring without identity. b. True or False: Every ring is a group.

Elements Of Modern Algebra
8th Edition
ISBN:9781285463230
Author:Gilbert, Linda, Jimmie
Publisher:Gilbert, Linda, Jimmie
Chapter8: Polynomials
Section8.1: Polynomials Over A Ring
Problem 15E: 15. Prove that if is an ideal in a commutative ring with unity, then is an ideal in .
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Q20:
a. Give an example for a commutative ring without identity.
b. True or False: Every ring is a group.
Transcribed Image Text:Q20: a. Give an example for a commutative ring without identity. b. True or False: Every ring is a group.
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