A grand union. Suppose you have two sets, and each set has the same cardinality as the set of natural numbers. Take the elements of both sets and put them together to make one huge set. Prove that this new huge set has the same cardinality as the set of natural numbers.
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Chapter 3 Solutions
The Heart of Mathematics: An Invitation to Effective Thinking, WileyPLUS NextGen Card with Loose-leaf Set Single Semester: An Invitation to Effective Thinking (Key Curriculum Press)
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