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Théorie spectrale

H. Buchwalter, D. Tarral (1982)

Publications du Département de mathématiques (Lyon)

Time regularity and functions of the Volterra operator

Zoltán Léka (2014)

Studia Mathematica

Our aim is to prove that for any fixed 1/2 < α < 1 there exists a Hilbert space contraction T such that σ(T) = 1 and | | T n + 1 - T | | ( n 1 ) . This answers Zemánek’s question on the time regularity property.

Toeplitz operators in the commutant of a composition operator

Bruce Cload (1999)

Studia Mathematica

If ϕ is an analytic self-mapping of the unit disc D and if H 2 ( D ) is the Hardy-Hilbert space on D, the composition operator C ϕ on H 2 ( D ) is defined by C ϕ ( f ) = f ϕ . In this article, we consider which Toeplitz operators T f satisfy T f C ϕ = C ϕ T f

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