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Found 332 Documents (Results 1–100)

On completeness of the system of root subspaces of a higher order non- selfadjoint operator of the Schrödinger type. (Russian) Zbl 0792.47019

Gol’tser, Ya. M. (ed.), Studies on differential equations and their applications. Alma-Ata: Kazakhskij Pedagogicheskij Institut Im. Abaya, 22-26 (1989).
MSC:  47A70 47B25 47F05
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Estimates for the difference of fractional powers of selfadjoint operators in the case of unbounded perturbations. (English. Russian original) Zbl 0784.47011

J. Sov. Math. 61, No. 2, 2018-2035 (1992); translation from Zap. Nauchn. Semin. Leningr. Otd. Mat. Inst. Steklova 178, 120-145 (1989).
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Theory of operator algebras and index theory. Proceedings of the symposium held at the Research Institute for Mathematical Sciences, Kyoto University, Kyoto (Japan), January 12-14, 1989. (Japanese, English) Zbl 0718.46021

RIMS Kokyuroku, 688. Kyoto: Kyoto University, Research Institute for Mathematical Sciences. ii, 109 p. (1989).
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Estimates of eigenvalues of a certain class of selfadjoint operators. Ed. by V. A. Tsetsokho. (Оценки собственных значений некоторого класса самосопряженных операторов.) (Russian) Zbl 0748.15018

Novosibirsk: Vychislitel’nyĭ Tsentr SO AN SSSR, 137 p. (1989).
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Linear algebra and geometry. Transl. from the 2nd Russian edition by M. E. Alferieff. (English) Zbl 0755.15002

Algebra, Logic and Applications. 1. New York etc.: Gordon & Breach Science Publishers. ix, 309 pp. (1989).
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Über Kommutanten von symmetrischen Operatoren und \(O^*\)-Algebren und Erweiterungen von *-Darstellungen. (On commutants of symmetric operators and \(O^*\)-algebras and extensions of *-representations). (German) Zbl 0698.47032

Leipzig: Univ., Diss. A. 97 S. (1989).
MSC:  47L60 47B25 47B47
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On the accuracy of eigenvalue bounds for selfadjoint operators. (Über die Genauigkeit von Eigenwertschranken für selbstadjungierte Operatoren.) (German) Zbl 0697.65047

Clausthal: Techn. Univ., Math.-Naturwiss. Fak., Diss. 85 S. (1989).
MSC:  65J10 47A10
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Multiparameter spectral theory in Hilbert space. (Mnogoparametricheskaya spektral’naya teoriya v gil’bertovom prostranstve.) (Russian) Zbl 0696.34018

Baku: Izdatel’stvo Azerbajdzhanskogo Gosudarstvennogo Universiteta. 88 p. (1989).
Reviewer: N.Vulchanov
MSC:  34L99 47E05 35P05
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Hilbert space approach to some classical transforms. (English) Zbl 0753.44002

Pitman Research Notes in Mathematics Series. 196. Harlow: Longman Scientific & Technical. New York: John Wiley & Sons, Inc. 203 p. (1989).
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Nondifferentiable perturbations of spectral problems for a pair of selfadjoint operators, and global bifurcation. (English. Russian original) Zbl 0719.47049

Sov. Math., Dokl. 38, No. 1, 122-126 (1989); translation from Dokl. Akad. Nauk SSSR 301, No. 3, 551-554 (1988).
MSC:  47J10 47J05 58E07
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Asymptotic form of Weyl-Titchmarsh function and the inverse problem for Dirac’s system. (English. Russian original) Zbl 0718.34086

Sov. J. Contemp. Math. Anal., Arm. Acad. Sci. 24, No. 4, 15-24 (1989); translation from Izv. Akad. Nauk Arm. SSR, Mat. 24, No. 4, 327-336 (1989).
MSC:  34E99
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A class of Hermitian operator extensions and the Weyl function. (English. Russian original) Zbl 0715.47013

Sov. Math. 33, No. 5, 116-122 (1989); translation from Izv. Vyssh. Uchebn. Zaved., Mat. 1989, No. 5(324), 71-75 (1989).
Reviewer: L.Zsido
MSC:  47B25 47A56 47A20
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Operator methods in hydrodynamics. Evolutionary and spectral problems. (Операторные методы в линейной гидродинамике. Ѐволюционные и спектральные задачи.) (Russian. English summary) Zbl 0681.76001

Moskva: Nauka. 416 p. R. 6.10 (1989).
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On the limiting behaviour of the spectrum of a sequence of operators defined on different Hilbert spaces. (English. Russian original) Zbl 0711.47003

Russ. Math. Surv. 44, No. 3, 195-196 (1989); translation from Usp. Mat. Nauk 44, No. 3(267), 157-158 (1989).
MSC:  47A10 47B15
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