Definition: Collection
A collection is a set whose elements are only sets.
NOTE
Set systems are also known as families of sets or set systems.
Definition: Subcollection
A subcollection of a collection is just a subset of .
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Definition: Collection
A collection is a set whose elements are only sets.
NOTE
Set systems are also known as families of sets or set systems.
Definition: Subcollection
A subcollection of a collection C is just a subset of C.
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