Hilbert-Schmidt integral operator

Hilbert-Schmidt integral operator

In mathematics, a Hilbert-Schmidt integral operator is a type of integral transform. Specifically, given a domain (an open and connected set) Ω in "n"-dimensional Euclidean space R"n", a Hilbert-Schmidt kernel is a function "k" : Ω × Ω → C with

:int_{Omega} int_{Omega} | k(x, y) |^{2} ,dx , dy < + infty

and the associated Hilbert-Schmidt integral operator is the operator "K" : "L"2(&Omega;; C) &rarr; "L"2(&Omega;; C) given by

:(K u) (x) = int_{Omega} k(x, y) u(y) , dy.

Hilbert-Schmidt integral operators are both continuous (and hence bounded) and compact.

See also

* Hilbert-Schmidt operator

References

* cite book
author = Renardy, Michael and Rogers, Robert C.
title = An introduction to partial differential equations
series = Texts in Applied Mathematics 13
edition = Second edition
publisher = Springer-Verlag
location = New York
year = 2004
pages = 356
isbn = 0-387-00444-0
(Sections 7.1 and 7.5)


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