| http://www.w3.org/ns/prov#value | - In particular, if M is a set and A a subset ofM, then CM A is also a set.3??. ( U n i o n a x i o m ) For any set M whose elements are sets there exists a set(J M, called the union of M and consisting of those elements and only those thatbelong to some element of M. If we use the phrase family of sets" instead of a set whose elements are sets",the axiom of union assumes a more familiar sound: th
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