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Displaying 6021 – 6040 of 11160

On positive solutions for a nonlinear boundary value problem with impulse

Huseyin Bereketoglu, Aydin Huseynov (2006)

Czechoslovak Mathematical Journal

In this paper we study nonlinear second order differential equations subject to separated linear boundary conditions and to linear impulse conditions. Sign properties of an associated Green’s function are investigated and existence results for positive solutions of the nonlinear boundary value problem with impulse are established. Upper and lower bounds for positive solutions are also given.

On positive solutions of semilinear elliptic problems

Pavol Quittner (1989)

Commentationes Mathematicae Universitatis Carolinae

On powers of $p$ -hyponormal and log-hyponormal operators.

Furuta, Takayuki, Yanagida, Masahiro (2000)

Journal of Inequalities and Applications [electronic only]

On precompact multiplication operators on weighted function spaces.

Alsulami, Hamed H., Alsulami, Saud M., Khan, Liaqat Ali (2009)

Acta Universitatis Apulensis. Mathematics - Informatics

On Pre-parareflexive Operator Algebras

Pawan Bala (1997)

Publications de l'Institut Mathématique

On pre-reflexive algebras and pre-reflexive operators

S. C. Arora, Kanta Aggarwal (1989)

Colloquium Mathematicae

On problems concerning extension of linear operations on linear spaces

František Charvát (1971)

Commentationes Mathematicae Universitatis Carolinae

On problems concerning uniqueness of the extension of linear operations on linear spaces

František Charvát (1971)

Commentationes Mathematicae Universitatis Carolinae

On product formulas for exponential functions.

Ch.Y. Lin, S.Y. Shaw (1985)

Semigroup forum

On product of projections

Mohammad Sal Moslehian (2004)

Archivum Mathematicum

An operator with infinite dimensional kernel is positive iff it is a positive scalar times a certain product of three projections.

On products of non-commuting sectorial operators

Frank Weber (1998)

Annali della Scuola Normale Superiore di Pisa - Classe di Scienze

On products of some Toeplitz operators on polyanalytic Fock spaces

Irène Casseli (2020)

Czechoslovak Mathematical Journal

The purpose of this paper is to study the Sarason’s problem on Fock spaces of polyanalytic functions. Namely, given two polyanalytic symbols $f$ and $g$ , we establish a necessary and sufficient condition for the boundedness of some Toeplitz products $T_{f} T_{\bar{g}}$ subjected to certain restriction on $f$ and $g$ . We also characterize this property in terms of the Berezin transform.

On proper boundary points of the spectrum and complemented eigenspaces.

Kristi Mattila (1978)

Mathematica Scandinavica

On Pseudo-Differential Operators and Smoothness of Special Lie-Group Representations.

H.O. Cordes (1979)

Manuscripta mathematica

On Pseudo-monotone Operators and Nonlinear Noncoercive Variational Problems on Unbounded Domains.

Rüdiger Landes, Vesa Mustonen (1980)

Mathematische Annalen

On pseudomonotone variational inequalities.

Fulina, Silvia (2006)

Analele Ştiinţifice ale Universităţii “Ovidius" Constanţa. Seria: Matematică

On pseudoparabolic optimal control problems

Igor Bock, Ján Lovíšek (1993)

Kybernetika

On Pták’s generalization of Hankel operators

Carmen H. Mancera, Pedro José Paúl (2001)

Czechoslovak Mathematical Journal

In 1997 Pták defined generalized Hankel operators as follows: Given two contractions $T_{1} \in ℬ (ℋ_{1})$ and $T_{2} \in ℬ (ℋ_{2})$ , an operator $X ℋ_{1} \to ℋ_{2}$ is said to be a generalized Hankel operator if $T_{2} X = X T_{1}^{*}$ and $X$ satisfies a boundedness condition that depends on the unitary parts of the minimal isometric dilations of $T_{1}$ and $T_{2}$ . This approach, call it (P), contrasts with a previous one developed by Pták and Vrbová in 1988, call it (PV), based on the existence of a previously defined generalized Toeplitz operator. There seemed to be a strong but somewhat...

On quadratic integral equations of Urysohn type in Fréchet spaces.

Benchohra, M., Darwish, M.A. (2010)

Acta Mathematica Universitatis Comenianae. New Series

On quantum extensions of the Azéma martingale semi-group

Alexander M. Chebotarev, Franco Fagnola (1995)

Séminaire de probabilités de Strasbourg

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