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Found 137 Documents (Results 1–100)

The truncated moment problem on parallel lines. (English) Zbl 1349.47020

Gaşpar, Dumitru (ed.) et al., The varied landscape of operator theory. Proceedings of the 24th international conference in operator theory, Timişoara, Romania, July 2–7, 2012. Bucharest: The Theta Foundation (ISBN 978-606-8443-04-1). Theta Series in Advanced Mathematics 17, 109-126 (2014).
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Matrix completions, moments, and sums of Hermitian squares. (English) Zbl 1236.15056

Princeton Series in Applied Mathematics. Princeton, NJ: Princeton University Press (ISBN 978-0-691-12889-4/hbk; 978-1-400-84059-5/ebook). xii, 518 p. (2011).
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Positive-definite operator-valued functions and the moment problem. (English) Zbl 1216.47024

Bercovici, Hari (ed.) et al., Operator theory live. Proceedings of the 22nd international conference on operator theory, Timişoara, Romania, July 3–8, 2008. Bucharest: The Theta Foundation (ISBN 978-973-87899-6-8). Theta Series in Advanced Mathematics 12, 113-123 (2010).
MSC:  47A57 44A60 15B57
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Dilatable solutions for some operator moment problems. (English) Zbl 1199.47077

Davidson, Kenneth R. (ed.) et al., Operator theory 20. Proceedings of the 20th international conference on operator theory, Timişoara, Romania, June 30–July 5, 2004. Bucharest: Theta (ISBN 978-973-85432-9-4; 973-85432-9-0). Theta Series in Advanced Mathematics 6, 181-195 (2006).
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On normal extensions of unbounded operators. IV: A matrix construction. (English) Zbl 1106.47021

Langer, Matthias (ed.) et al., Operator theory and indefinite inner product spaces. Presented on the occasion of the retirement of Heinz Langer in the colloquium on operator theory, Vienna, March 2004. Basel: Birkhäuser (ISBN 3-7643-7515-9/hbk). Operator Theory: Advances and Applications 163, 337-350 (2006).
MSC:  47B15 47B20 47A20
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Similarity of indefinite Sturm–Liouville operators with singular potential to a self-adjoint operator. (English. Russian original) Zbl 1097.47045

Math. Notes 78, No. 1, 134-139 (2005); translation from Mat. Zametki 78, No. 1, 147-151 (2005).
MSC:  47E05 34B24 34L40
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On the Friedrichs and the Kreĭn–von Neumann extension of nonnegative relations. (English) Zbl 1096.47004

Laaksonen, Matti (ed.) et al., Contributions to management science, mathematics and modelling. Essays in honour of Professor Ilkka Virtanen. Vaasa: Universitas Wasaensis (ISBN 952-476-033-9). Acta Wasaensia 122, Mathematics 9, 37-54 (2004).
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Infinite extensions of Toeplitz matrices. (English. Russian original) Zbl 1091.47023

J. Math. Sci., New York 127, No. 3, 1957-1961 (2005); translation from Zap. Nauchn. Semin. POMI 296, 5-14 (2003).
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On the similarity of operators of the type \(\text{sgn}\,x(-\frac{d^2}{dx^2}+c\delta)\) to a normal and a selfadjoint operator. (English. Russian original) Zbl 1057.47050

Math. Notes 74, No. 1, 127-131 (2003); translation from Mat. Zametki 74, No. 1, 134-139 (2003).
MSC:  47E05 47B25
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Generalized Nevanlinna functions with polynomial asymptotic behaviour at infinity and regular perturbations. (English) Zbl 0989.46009

Bart, H. (ed.) et al., Operator theory and analysis. The M. A. Kaashoek anniversary volume. Proceedings of the workshop, Amsterdam, Netherlands, November 12-14, 1997. Basel: Birkhäuser. Oper. Theory, Adv. Appl. 122, 169-189 (2001).
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An operator-theoretic approach to truncated moment problems. (English) Zbl 0884.47006

Janas, Jan (ed.) et al., Linear operators. Proceedings of the semester organized at the Stefan Banach International Mathematical Center, Warsaw, Poland, February 7–May 15, 1994. Warsaw: Polish Academy of Sciences, Inst. of Mathematics, Banach Cent. Publ. 38, 75-104 (1997).
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Operators on indefinite inner product spaces. (English) Zbl 0883.47019

Böttcher, Albrecht (ed.) et al., Lectures on operator theory and its applications, Fields Institute for Research in Mathematical Sciences, Toronto, Canada 1994. Providence, RI: American Mathematical Society. Fields Inst. Monogr. 3, 143-232 (1996).
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Operator theory and ordinary differential operators. (English) Zbl 0883.47018

Böttcher, Albrecht (ed.) et al., Lectures on operator theory and its applications, Fields Institute for Research in Mathematical Sciences, Toronto, Canada 1994. Providence, RI: American Mathematical Society. Fields Inst. Monogr. 3, 75-139 (1996).
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Selfadjoint extensions for a class of symmetric operators with defect numbers (1,1). (English) Zbl 0861.47015

Gheondea, A. (ed.) et al., Topics in operator theory, operator algebras and applications. 15th international conference on operator theory, Timişoara, Romania, June 6–10, 1994. Bucharest: Institute of Mathematics of the Romanian Academy. 115-145 (1995).
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Quasi-self-adjoint contracting dilations of a Hermitian contraction. (English. Russian original) Zbl 0703.47005

J. Sov. Math. 49, No. 6, 1241-1247 (1990); translation from Teor. Funkts., Funkts. Anal. Prilozh. 50, 9-16 (1988).
Reviewer: Sun Shanli
MSC:  47A20 47B15
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The resolvent matrix of an Hermitian operator and a moment problem with gaps. (English. Russian original) Zbl 0756.47027

Sov. Math., Dokl. 42, No. 2, 429-435 (1991); translation from Dokl. Akad. Nauk SSSR 314, No. 2, 273-278 (1990).
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