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For n dimensions, n + 1 reference points are sufficient to fully define a reference frame. Using rectangular Cartesian coordinates, a reference frame may be defined with a reference point at the origin and a reference point at one unit distance along each of the n coordinate axes. [citation needed]
This is usually displayed as a superscript footnote number: [1] The second necessary part of the citation or reference is the list of full references, which provides complete, formatted detail about the source, so that anyone reading the article can find it and verify it. This page explains how to place and format both parts of the citation.
Sometimes it will be tagged first with a "citation needed" template to give editors a chance to find and add sources, but some editors will simply remove it because they question its veracity. This tutorial will show you how to add inline citations to articles, and also briefly explain what Wikipedia considers to be a reliable source.
Surprising or apparently important claims not covered by mainstream sources; Reports of a statement by someone that seems out of character, embarrassing, controversial, or against an interest they had previously defended;
Information in Wikipedia is often accompanied by a reference. You can use Wikipedia to find the source of the information and cite that. Indeed, Wikipedia can often be a good starting point for research to other sources of information. Some Wikipedia articles have been published in peer reviewed academic literature. In that case, it is possible ...
The extra parameters available in the {{Citation needed span}} template may allow you to indicate which section you want to refer to. Do not insert a "Citation needed" tag to make a point, to "pay back" another editor, or because you "don't like" a subject, a particular article, or another editor.
Citations are important in Wikipedia to ensure that information comes from actual, reliable sources (WP:V, WP:CITE). There are three preferred ways of citing sources: Footnotes; Footnotes with list-defined references; Shortened footnotes
A datum reference or just datum (plural: datums [Note 1]) is some important part of an object—such as a point, line, plane, hole, set of holes, or pair of surfaces—that serves as a reference in defining the geometry of the object and (often) in measuring aspects of the actual geometry to assess how closely they match with the nominal value, which may be an ideal, standard, average, or ...