Question 3. > Given the triple < Zx 3Z, +,- defined in terms of the Cartesian product Z x 3Z of two rings Z, and 3Z under operations (k, 3m) + (1,3n) = (k+1,3m +3n) and (k, 3m) - (1,3n) = (kl. 9mn) for k, l, m, n € Z. (a) Prove that < Z x 3Z, +, -> is a ring. Is it a commutative ring? Justify your answer. (b) Does the triple < Zx 3Z, +, > form an integral domain? Justify your answer.

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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Question 3.
Given the triple Zx 3Z, +, defined in terms of
the Cartesian product Z x 3Z of two rings Z, and 3Z under operations (k, 3m) + (1,3n) =
(k+1,3m + 3n) and (k, 3m) - (1,3n) = (kl, 9mn) for k, l, m, n € Z
(a) Prove that < Z × 3Z, +, > is a ring. Is it a commutative ring? Justify your answer.
(b) Does the triple < Z x 3Z, +, > form an integral domain? Justify your answer.
Transcribed Image Text:Question 3. Given the triple Zx 3Z, +, defined in terms of the Cartesian product Z x 3Z of two rings Z, and 3Z under operations (k, 3m) + (1,3n) = (k+1,3m + 3n) and (k, 3m) - (1,3n) = (kl, 9mn) for k, l, m, n € Z (a) Prove that < Z × 3Z, +, > is a ring. Is it a commutative ring? Justify your answer. (b) Does the triple < Z x 3Z, +, > form an integral domain? Justify your answer.
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