WikiJournal of Science/Spaces in mathematics/XML
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<full_title>WikiJournal of Science/Spaces in mathematics</full_title>
<abbrev_title>Wiki.J.Sci.</abbrev_title>
<issn media_type='electronic'>2002-4436 / 2470-6345 / 2639-5347</issn>
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<year>2019</year>
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<title>Spaces in mathematics</title>
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<surname>et al.</surname><affiliation>Wikipedia editors of Space (mathematics)</affiliation><link>https://xtools.wmflabs.org/articleinfo/en.wikipedia.org/Space_(mathematics)//2018-05-31</link>
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<year>2019</year>
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<doi>10.15347/wjs/2018.002</doi>
<resource>https://en.wikiversity.org/wiki/WikiJournal of Science/Spaces in mathematics</resource>
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This is an open access article distributed under the [http://creativecommons.org/licenses/by-sa/3.0/ Creative Commons Attribution ShareAlike License], which permits unrestricted use, distribution, and reproduction, provided the original author and source are credited.</license-p>
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<span class="anchor" id="Figure 1"></span> <span class="anchor" id="Fig 1"></span> <span class="anchor" id="Fig. 1"></span> <span class="anchor" id="Image 1"></span> <span class="anchor" id="Figure1"></span> <span class="anchor" id="Fig1"></span> <span class="anchor" id="Fig.1"></span> <span class="anchor" id="Image1"></span> <div style="text-align: left; float:right; clear:right; padding:0px 0px 15px 10px; "> <div style="font-size: 90%; line-height: 1.3em; width: calc(250px ); "> <div style="position:relative; "> 250px </div> <div class="thumbcaption" style = "font-weight: normal;"> Overview of types of abstract spaces. An arrow from space ''A'' to space ''B'' implies that space ''A'' is also a kind of space ''B''. That means, for instance, that a normed vector space is also a metric space. </div> <span class="plainlinks" style = "font-style: italic;"><span style="font-size:85%;"><br>Stefan Eckert, [https://creativecommons.org/licenses/by-sa/3.0/deed.en CC-BY-SA 3.0]</span></span> </div></div> While modern mathematics use many types of spaces, such as Euclidean spaces, linear spaces, topological spaces, Hilbert spaces, or probability spaces, it does not define the notion of "space" itself. A space consists of selected mathematical objects that are treated as points, and selected relationships between these points. The nature of the points can vary widely: for example, the points can be elements of a set, functions on another space, or subspaces of another space. It is the relationships that define the nature of the space. More precisely, isomorphic spaces are considered identical, where an isomorphism between two spaces is a one-to-one correspondence between their points that preserves the relationships. For example, the relationships between the points of a three-dimensional Euclidean space are uniquely determined by Euclid's axioms, and all three-dimensional Euclidean spaces are considered identical. Topological notions such as continuity have natural definitions in every Euclidean space. However, topology does not distinguish straight lines from curved lines, and the relation between Euclidean and topological spaces is thus "forgetful". Relations of this kind are sketched in Figure 1, and treated in more detail in the Section "Types of spaces". It is not always clear whether a given mathematical object should be considered as a geometric "space", or an algebraic "structure". A general definition of "structure", proposed by Bourbaki , embraces all common types of spaces, provides a general definition of isomorphism, and justifies the transfer of properties between isomorphic structures.
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