THE mathematicians’ version of nothing is the empty set. This is a collection that doesn’t actually contain anything, such as my own collection of vintage Rolls-Royces. The empty set may seem a bit ...

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This article is about nothing: nothing at all, as encapsulated in the number zero and the empty set. It took humanity millennia to move beyond the counting numbers. Zero emerged in several ...

Many animal species can identify small numbers of objects, but it was previously thought that only primates are capable of recognizing the empty set, representing zero, one of the most important ...