How to use functions to prove set of all natural numbers
1. Give two different functions and illustrate how to use each of functions to prove set of all natural numbers is infinite.
Prove the following.
2. If X and Y are infinite, then X U Y is infinite.
3. If X and Y are infinite, then X x Y is infinite.
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Give two different functions and illustrate how to use each of functions to prove set of all natural numbers is infinite. Prove the following. If X and Y are infinite, then X U Y is infinite.
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