SOLUTION: The negative number integers are closed under subtraction.
Algebra.Com
Question 782589: The negative number integers are closed under subtraction.
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!
This is false since for example -2 minus - 10 = -2 - (-10) = -2 + 10 = 8 which is NOT positive. There are infinitely many of these examples.
If this was closed (truly closed), then the result would always be negative. But it's not, so it's not closed.
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