How do I prove that N+ (positive natural numbers) are closed under multiplication? Any advice...Thanks in advance.
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Originally Posted by jzellt How do I prove that N+ (positive natural numbers) are closed under multiplication? Any advice...Thanks in advance. see here. what you want is on the last page. but the proof refers to things on previous pages.
Originally Posted by jzellt How do I prove that N+ (positive natural numbers) are closed under multiplication? Any advice...Thanks in advance. We know there is a unique function such that for all . We will write instead of . Now we want to prove that if then . Well, here is a hint, if then .
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