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Yep. That's the whole in it. Dividing by 0 gives infinityyyyyyy... and beyond 
In mathematics, cardinal numbers, or cardinals for short, are a generalized kind of number used to denote the size of a set. While for finite sets the size is given by a natural number - the number of elements - cardinal numbers (cardinality) can also classify degrees of infinity. On one hand, a proper subset A of an infinite set S may have the same cardinality as S. On the other hand, perhaps also counterintuitively, not all infinite objects are of the same size. There is a formal characterization of how some infinite objects are strictly smaller than other infinite objects.