Quote:
Originally Posted by Fletch1373
wouldn't it have to be 0 though? the commutative property of addition...
infinity - infinity = infinity...
-infinity + infinity = -infinity... right?
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I think infinity minus infinity is undefined. You can add and multiply (the result is still inifinity) but not subtract or divide. So (somebody correct me if I'm wrong):
inf + inf = inf
(-inf) + (-inf) = -(inf + inf) = -inf
inf x inf = inf
(-inf) x (-inf) = (-1 x -1)(inf x inf) = inf
inf - inf => undefined
inf/inf => undefined
Weird, but infinity is not actually a number, but a concept of increase beyond bounds.