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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 ...
Lists and tables are two different ways to format multiple, similar items on a page. Lists and HTML tables go back to Wikipedia's early days. The current wikicode tables (see the section about tables), which you can edit more easily and even sort, came later. You'll find many more lists than tables on Wikipedia.
[[Category:Wikipedia table of contents templates]] to the <includeonly> section at the bottom of that page. Otherwise, add <noinclude>[[Category:Wikipedia table of contents templates]]</noinclude> to the end of the template code, making sure it starts on the same line as the code's last character.
A less common alternative is placing the table of contents on the right, using the template {}. If you look at the wikitext for Figure 13-13, you see the {} template at the top of the edit box. No text should ever be in the lead section above this template. Figure 13-13. This article has the table of contents on the right.
The format is the same as for the |style= parameter. item1_style , item2_style , item3_style ... – custom css styles for each of the list items. The format is the same as for the |style= parameter.
This page lists ways to create several kinds of compact tables of contents (TOC). Please note that a normal compact TOC will not work when put on Category pages; this page contains a separate section instructing you how to put a compact TOC on Category pages.
Category:Wikipedia tables: lists even more table help pages. Help:Introduction to tables with Wiki Markup. Wikipedia:Manual of Style/Tables: the Manual of Style indicates best practices for tables. Wikipedia:Table dos and don'ts: a quick guide to the Manual of Style for tables. mw:Help:Tables; User:Dcljr/Tables: table tutorials.