## Never divide by zero

Posted by Maiu
on August 22, 2013

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I could be wrong, but aren’t 0, 0-, and 0+ completely different things?

This is exactly how my pre-calcIII professor taught us to do limits.

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lim x->0 only exists if lim x->0- and lim x->0+ exist and are equal. But if 0- and 0+ are equal then 0 is the same.

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