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In [[mathematical analysis]], the word '''''region''''' usually refers to a subset of <math>\R^n</math> or <math>\C^n</math> that is [[open set|open]] (in the standard [[Euclidean topology]]), [[connected set|connected]] and [[empty set|non-empty]]. A '''closed region''' is sometimes defined to be the [[closure (topology)|closure]] of a region. | |||
Regions and closed regions are often used as domains of functions or differential equations. | |||
According to Kreyszig,<ref>[[Erwin Kreyszig]] (1993) ''Advanced Engineering Mathematics'', 7th edition, p. 720, [[John Wiley & Sons]], ISBN 0-471-55380-8</ref> | |||
:A region is a set consisting of a [[domain (mathematical analysis)|domain]] plus, perhaps, some or all of its boundary points. (The reader is warned that some authors use the term "region" for what we call a domain [following standard terminology], and others make no distinction between the two terms.) | |||
According to Yue Kuen Kwok, | |||
:An open connected set is called an ''open region'' or ''domain''. ...to an open region we may add none, some, or all its [[limit point]]s, and simply call the new set a ''region''.<ref>Yue Kuen Kwok (2002) ''Applied Complex Variables for Scientists and Engineers'', § 1.4 Some topological definitions, p 23, [[Cambridge University Press]], ISBN 0-521-00462-4</ref> | |||
==See also== | |||
* [[Jordan curve theorem]] | |||
* [[Riemann mapping theorem]] | |||
* [[Domain (mathematical analysis)]] | |||
==Notes and references== | |||
{{Reflist}} | |||
* Ruel V. Churchill (1960) ''Complex variables and applications'', 2nd edition, §1.9 Regions in the complex plane, pp. 16 to 18, [[McGraw-Hill]] | |||
* [[Constantin Carathéodory]] (1954) ''Theory of Functions of a Complex Variable'', v. I, p. 97, [[Chelsea Publishing]]. | |||
* [[Howard Eves]] (1966) ''Functions of a Complex Variable'', p. 105, Prindle, Weber & Schmidt. | |||
[[Category:Mathematical analysis]] | |||
[[Category:Topology]] | |||
Revision as of 06:13, 6 January 2014
In mathematical analysis, the word region usually refers to a subset of or that is open (in the standard Euclidean topology), connected and non-empty. A closed region is sometimes defined to be the closure of a region.
Regions and closed regions are often used as domains of functions or differential equations.
According to Kreyszig,[1]
- A region is a set consisting of a domain plus, perhaps, some or all of its boundary points. (The reader is warned that some authors use the term "region" for what we call a domain [following standard terminology], and others make no distinction between the two terms.)
According to Yue Kuen Kwok,
- An open connected set is called an open region or domain. ...to an open region we may add none, some, or all its limit points, and simply call the new set a region.[2]
See also
Notes and references
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- Ruel V. Churchill (1960) Complex variables and applications, 2nd edition, §1.9 Regions in the complex plane, pp. 16 to 18, McGraw-Hill
- Constantin Carathéodory (1954) Theory of Functions of a Complex Variable, v. I, p. 97, Chelsea Publishing.
- Howard Eves (1966) Functions of a Complex Variable, p. 105, Prindle, Weber & Schmidt.
- ↑ Erwin Kreyszig (1993) Advanced Engineering Mathematics, 7th edition, p. 720, John Wiley & Sons, ISBN 0-471-55380-8
- ↑ Yue Kuen Kwok (2002) Applied Complex Variables for Scientists and Engineers, § 1.4 Some topological definitions, p 23, Cambridge University Press, ISBN 0-521-00462-4