Math from scratch, part five: natural subtraction

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.

ericlippert.com · Oct 04, 13 by Tony Thomas

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