Asked by Katherine

True or false? Negative numbers are closed under addition. Give a counterexample
True or false? Prime numbers are closed under subtraction. Give a counterexample
True or false? Natural numbers are closed under division. Give a counterexample
Answered by Steve
I'll do one; you try the others.

True or false? Negative numbers are closed under addition.

True: for any positive a,b
-a + -b = -(a+b)
Answered by Sarina
False
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