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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]
There are three types of lists: unordered lists, ordered lists, and description lists (a.k.a. definition lists or association lists). In the following sections, various list types are used for different examples, but other list types will generally give corresponding results.
symbol, which tells Wikipedia to format that cell as a heading. Exactly how that heading appears to the viewer depends on the viewer's browser. Comparing 4 to 5, the reason that cells B3 and B4 are bolded (treated like headings) is because they're on the same line as row heading 2, which has an "!" in front of it. Row 4 is correct; row 5 is ...
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
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The ordered pair (a, b) is different from the ordered pair (b, a), unless a = b. In contrast, the unordered pair , denoted { a , b }, equals the unordered pair { b , a }. Ordered pairs are also called 2-tuples , or sequences (sometimes, lists in a computer science context) of length 2.
This guide presents the typical layout of Wikipedia articles, including the sections an article usually has, ordering of sections, and formatting styles for various elements of an article. For advice on the use of wiki markup , see Help:Editing ; for guidance on writing style, see Manual of Style .
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.