Suppose there exists a collection of finite sets which is finite.
We pick up the minimal sub-collection such that any set in the collection can be expressed as a union of sets in the sub-collection.
Is the minimal sub-collection unique?
Suppose there exists a collection of finite sets which is finite.
We pick up the minimal sub-collection such that any set in the collection can be expressed as a union of sets in the sub-collection.
Is the minimal sub-collection unique?