In mathematics, a Dirichlet algebra is a particular type of algebra associated to a compact Hausdorff space X. It is a closed subalgebra of C(X), the uniform algebra of bounded continuous functions on X, whose real parts are dense in the algebra of bounded continuous real functions on X. The concept was introduced by Andrew Gleason (1957).
is a *-subalgebra of , and of . If is dense in , we say is a Dirichlet algebra.
It can be shown that if an operator has as a spectral set, and is a Dirichlet algebra, then has a normal boundary dilation. This generalises Sz.-Nagy's dilation theorem, which can be seen as a consequence of this by letting
- Gleason, Andrew M. (1957), "Function algebras", in Morse, Marston; Beurling, Arne; Selberg, Atle, Seminars on analytic functions: seminar III : Riemann surfaces ; seminar IV : theory of automorphic functions ; seminar V : analytic functions as related to Banach algebras 2, Institute for Advanced Study, Princeton, pp. 213–226, Zbl 0095.10103
- Nakazi, T. (2001), "Dirichlet algebra", in Hazewinkel, Michiel, Encyclopedia of Mathematics, Springer, ISBN 978-1-55608-010-4
- Completely Bounded Maps and Operator Algebras Vern Paulsen, 2002 ISBN 0-521-81669-6
- Wermer, John (November 2009), Bolker, Ethan D., ed., "Andrew M. Gleason 1921–2008" (PDF), Notices of the American Mathematical Society 56 (10): 1248–1251
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