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By mswatcher
via ericlippert.com
Submitted: Oct 04 2013 / 10:59

Ok, addition and multiplication are in the can. Those are the easy ones because the set of natural numbers is "closed" over those operations. That is, if you have any two naturals then both their sum and their product is also a natural. Not so subtraction! To see why, first we have to state what subtraction really is.
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