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- Unordered_pair abstract "In mathematics, an unordered pair or pair set is a set of the form {a, b}, i.e. a set having two elements a and b with no particular relation between them. In contrast, an ordered pair (a, b) has a as its first element and b as its second element. While the two elements of an ordered pair (a, b) need not be distinct, modern authors only call {a, b} an unordered pair if a ≠ b.But for a few authors a singleton is also considered an unordered pair, although today, most would say that {a,a} is a multiset. It is typical to use the term unordered pair even in the situation where the elements a and b could be equal, as long as this equality has not yet been established.A set with precisely two elements is also called a 2-set or (rarely) a binary set.An unordered pair is a finite set; its cardinality (number of elements) is 2 or (if the two elements are not distinct) 1.In axiomatic set theory, the existence of unordered pairs is required by an axiom, the axiom of pairing.More generally, an unordered n-tuple is a set of the form {a1, ,a2,... an}.".
- Unordered_pair wikiPageID "1112432".
- Unordered_pair wikiPageRevisionID "552328978".
- Unordered_pair hasPhotoCollection Unordered_pair.
- Unordered_pair subject Category:Basic_concepts_in_set_theory.
- Unordered_pair type Abstraction100002137.
- Unordered_pair type BasicConceptsInSetTheory.
- Unordered_pair type Cognition100023271.
- Unordered_pair type Concept105835747.
- Unordered_pair type Content105809192.
- Unordered_pair type Idea105833840.
- Unordered_pair type PsychologicalFeature100023100.
- Unordered_pair comment "In mathematics, an unordered pair or pair set is a set of the form {a, b}, i.e. a set having two elements a and b with no particular relation between them. In contrast, an ordered pair (a, b) has a as its first element and b as its second element.".
- Unordered_pair label "Coppia non ordinata".
- Unordered_pair label "Paarmenge".
- Unordered_pair label "Paire".
- Unordered_pair label "Unordered pair".
- Unordered_pair label "二元集合".
- Unordered_pair sameAs Paarmenge.
- Unordered_pair sameAs Paire.
- Unordered_pair sameAs Coppia_non_ordinata.
- Unordered_pair sameAs m.0471jg.
- Unordered_pair sameAs Q1477744.
- Unordered_pair sameAs Q1477744.
- Unordered_pair sameAs Unordered_pair.
- Unordered_pair wasDerivedFrom Unordered_pair?oldid=552328978.
- Unordered_pair isPrimaryTopicOf Unordered_pair.