Ultra annihilation and creation operators
Schmeelk, John, Takaci, Arpad (1992)
Portugaliae mathematica
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Schmeelk, John, Takaci, Arpad (1992)
Portugaliae mathematica
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S. Kwapień (1968)
Studia Mathematica
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Vijay Gupta (1995)
Publicacions Matemàtiques
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In the present paper, we prove a global direct theorem for the modified Baskakov type operators in terms of so called Ditzian-Totik modulus of smoothness.
A. Pełczyński (1967)
Studia Mathematica
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Michele Campiti (1992)
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze
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Dumitru Popa (1997)
Collectanea Mathematica
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M. Gil (1992)
Studia Mathematica
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Let A be a closed linear operator acting in a separable Hilbert space. Denote by co(A) the closed convex hull of the spectrum of A. An estimate for the norm of f(A) is obtained under the following conditions: f is a holomorphic function in a neighbourhood of co(A), and for some integer p the operator is Hilbert-Schmidt. The estimate improves one by I. Gelfand and G. Shilov.
Ernst J. Albrecht, Florian-Horia Vasilescu (1974)
Czechoslovak Mathematical Journal
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