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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 {a 1, a 2,... a n}. [5] [6] [7]
English: A complete beginner's guide to editing Wikipedia using the visual editor to add information, add a reference source in a citation, and then add an edit summary and save. Date 9 March 2018
2 Unordered pairs and binary sets are different and distinct concepts
Unordered pair, or pair set, in mathematics and set theory; Ordered pair, or 2-tuple, in mathematics and set theory; Pairing, in mathematics, an R-bilinear map of modules, where R is the underlying ring; Pair type, in programming languages and type theory, a product type with two component types; Topological pair, an inclusion of topological spaces
Lattices, partial orders in which each pair of elements has a greatest lower bound and a least upper bound. Many different types of lattice have been studied; see map of lattices for a list. Partially ordered sets (or posets ), orderings in which some pairs are comparable and others might not be
The Cartesian product is used to create the set of ordered pairs C from the two sets A B, e.g. C:=A×B. What symbol is used to denote the set of unordered pairs created from those two sets ? MathMartin 14:35, 7 Jan 2005 (UTC) That idea is used so seldom that I am not aware of any standard notation for it. JRSpriggs 07:22, 10 June 2006 (UTC)
Wikipedia:User page design guide/Style; Wikipedia:Extended image syntax: advanced visual file markup. Help:A quick guide to templates: an introduction to templates. Help:Substitution: substitution is an alternative way of including templates than transclusion. Help:Score: how to render musical scores.
Separating unordered list items with blank lines may look approximately normal on-screen, but it creates many separate one-item lists, which is a problem for people using screen readers and is discouraged by the guideline on accessibility for people with disabilities, and is also problematic for machine analysis of the article, and for reuse of ...