Question

The order of a singleton set is..​

Answer 1

Answer:

A singleton has the property that every function from it to any arbitrary set is injective. The only non-singleton set with this property is the empty set. The Bell number integer sequence counts the number of partitions of a set (OEIS: A000110), if singletons are excluded then the numbers are smaller (OEIS: A000296).

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Answer 2

A singleton has the property that every function from it to any arbitrary set is injective. The only non-singleton set with this property is the empty set. The Bell number integer sequence counts the number of partitions of a set (OEIS: A000110), if singletons are excluded then the numbers are smaller (OEIS: A000296).