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In [[mathematics]], a '''paraproduct''' is a [[non-commutative]] [[bilinear operator]] acting on [[function (mathematics)|functions]] that in some sense is like the [[product (mathematics)|product]] of the two functions it acts on. According to [[Svante Janson]] and Jaak Peetre, in an article from 1988,<ref>Svante Janson and Jaak Peetre, [http://www.jstor.org/stable/2000875 "Paracommutators-Boundedness and Schatten-Von Neumann Properties"], ''Transactions of the American Mathematical Society'', Vol. 305, No. 2 (Feb., 1988), pp. 467–504.</ref> "the name 'paraproduct' denotes an idea rather than a unique definition; several versions exist and can be used for the same purposes." | |||
This said, for a given operator <math>\Lambda</math> to be defined as a paraproduct, it is normally required to satisfy the following properties: | |||
* It should "reconstruct the product" in the sense that for any pair of functions, <math>(f, g)</math> in its domain, | |||
:: <math>fg = \Lambda(f, g) + \Lambda(g, f).</math> | |||
* For any appropriate functions, <math>f</math> and <math>h</math> with <math>h(0)=0</math>, it is the case that <math>h(f) = \Lambda(f, h'(f))</math>. | |||
* It should satisfy some form of the [[Leibnitz rule]]. | |||
A paraproduct may also be required to satisfy some form of [[Hölder's inequality]]. | |||
==Notes== | |||
{{Reflist}} | |||
==Further references== | |||
* Árpád Bényi, Diego Maldonado, and Virginia Naibo, [http://www.ams.org/notices/201007/rtx100700858p.pdf "What is a Paraproduct?"], ''Notices of the American Mathematical Society'', Vol. 57, No. 7 (Aug., 2010), pp. 858–860. | |||
[[Category:Bilinear operators]] | |||
{{algebra-stub}} | |||
Latest revision as of 06:13, 15 September 2013
In mathematics, a paraproduct is a non-commutative bilinear operator acting on functions that in some sense is like the product of the two functions it acts on. According to Svante Janson and Jaak Peetre, in an article from 1988,[1] "the name 'paraproduct' denotes an idea rather than a unique definition; several versions exist and can be used for the same purposes."
This said, for a given operator to be defined as a paraproduct, it is normally required to satisfy the following properties:
- For any appropriate functions, and with , it is the case that .
- It should satisfy some form of the Leibnitz rule.
A paraproduct may also be required to satisfy some form of Hölder's inequality.
Notes
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Further references
- Árpád Bényi, Diego Maldonado, and Virginia Naibo, "What is a Paraproduct?", Notices of the American Mathematical Society, Vol. 57, No. 7 (Aug., 2010), pp. 858–860.
- ↑ Svante Janson and Jaak Peetre, "Paracommutators-Boundedness and Schatten-Von Neumann Properties", Transactions of the American Mathematical Society, Vol. 305, No. 2 (Feb., 1988), pp. 467–504.