Give an example of a set of numbers that is: a.Closed under both addition and multiplication. b.Closed under multiplication but not addition. c.Not closed under either multiplication or addition.
Give an example of a set of numbers that is: a.Closed under both addition and multiplication. b.Closed under multiplication but not addition. c.Not closed under either multiplication or addition.
Algebra: Structure And Method, Book 1
(REV)00th Edition
ISBN:9780395977224
Author:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole
Publisher:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole
Chapter2: Working With Real Numbers
Section2.1: Basic Assumptions
Problem 40WE
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Give an example of a set of numbers that is:
a.Closed under both addition and multiplication.
b.Closed under multiplication but not addition.
c.Not closed under either multiplication or addition.
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