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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]
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 ...
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 (number), two of something, a pair; 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
As an editor, treat problematical lists exactly like other problem articles, as described in Chapter 19: Deleting existing articles. If you see what looks like a bad list, you might want to post a question on the talk page of the guideline Wikipedia:Stand-alone lists (shortcut: WP:SAL) before formally proposing the list for deletion.
To edit a page using VisualEditor, click on the "Edit" tab at the top of the page. It can take a few seconds for the page to open for editing, and longer if the page is very large. Clicking on the "Edit source" tab will open the classic wikitext source editor. You can also open VisualEditor by clicking on the "edit" link on each section.
This module is subject to page protection.It is a highly visible module in use by a very large number of pages, or is substituted very frequently. Because vandalism or mistakes would affect many pages, and even trivial editing might cause substantial load on the servers, it is protected from editing.
Pages for logged out editors learn more. ... (Top) 1 Requested move. 4 comments. 2 Unordered pairs and binary sets are ... Talk: Unordered pair. Add languages. Page ...