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Wyświetlanie pozycji 17-36 z 43
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Linear combination of projections in von Neumann factors
(Springer Nature, 2020)It is shown that any self-adjoint operator in a finite discrete or infinite von Neumann factor can be written as a real linear combination of 4 projections. On the other hand, in any type II1 algebra and in any type II∞ ... -
Milnor Numbers of Deformations of Semi-Quasi-Homogeneous Plane Curve Singularities
(Springer Nature, 2019)The aim of this paper is to show the possible Milnor numbers of deformations of semi-quasi-homogeneous isolated plane curve singularity f. Assuming that f is irreducible, one can write f=∑qα+pβ ≥ pqcαβ xαyβ where cp0c0q≠0, ... -
Module of geodesic foliation on the flat torus
(Wydawnictwo Politechniki Częstochowskiej, 2014)We study properties of geodesic foliations on the flat, n-dimensional torus. Using the isomorphism of the Hodge star, we obtain some facts concerning compact totally geodesic surfaces (which are the leaves of geodesic ... -
Monotone iterative procedure and systems of a finite number of nonlinear fractional differential equations
(Springer International Publishing, 2015-06-03)The aim of the paper is to present a nontrivial and natural extension of the comparison result and the monotone iterative procedure based on upper and lower solutions, which were recently established in (Wang et al. in ... -
Multi Ping-Pong and an Entropy Estimate in Groups
(De Gruyter, 2018)We provide an entropy estimate from below for a finitely generated group of transformation of a compact metric space which contains a ping-pong game with several players located anywhere in the group. -
Multivalued SK-contractions with respect to b-generalized pseudodistances
(Springer Basel, 2015-04-09)A new class of multivalued non-self-mappings, called SK-contractions with respect to b-generalized pseudodistances, is introduced and used to investigate the existence of best proximity points by using an appropriate ... -
Necessary and Sufficient Conditions for Robust Minimal Solutions in Uncertain Vector Optimization
(Springer Nature, 2020)We introduce a new notion of a vector-based robust minimal solution for a vector-valued uncertain optimization problem, which is defined by means of some open cone. We present necessary and sufficient conditions for this ... -
New generalized fuzzy metrics and fixed point theorem in fuzzy metric space
(Springer, 2014-12-08)In this paper, in fuzzy metric spaces (in the sense of Kramosil and Michalek (Kibernetika 11:336-344, 1957)) we introduce the concept of a generalized fuzzy metric which is the extension of a fuzzy metric. First, inspired ... -
On a Nonsmooth Gauss–Newton Algorithms for Solving Nonlinear Complementarity Problems
(MDPI, 2020)In this paper, we propose a new version of the generalized damped Gauss–Newton method for solving nonlinear complementarity problems based on the transformation to the nonsmooth equation, which is equivalent to some ... -
On best proximity points for set-valued contractions of Nadler type with respect to b-generalized pseudodistances in b-metric spaces
(Springer, 2014-02-14)In this paper, in b-metric space, we introduce the concept of b-generalized pseudodistance which is an extension of the b-metric. Next, inspired by the ideas of Nadler (Pac. J. Math. 30:475-488, 1969) and Abkar and Gabeleh ... -
On conformal submersions with geodesic or minimal fibers
(Springer, 2020)We prove that every conformal submersion from a round sphere onto an Einstein manifold with fbers being geodesics is—up to an isometry—the Hopf fbration composed with a conformal difeomorphism of the complex projective ... -
On the existence of an optimal solution of the Mayer problem governed by 2D continuous counterpart of the Fornasini-Marchesini model
(Springer US, 2012-10-23)In the paper the optimization problem described by some nonlinear hyperbolic equation being continuous counterpart of the Fornasini-Marchesini model is considered. A theorem on the existence of at least one solution to ... -
On the lattice of polynomials with integer coefficients: successive minima in L2 (0, 1)
(Instytut Matematyczny Polskiej Akademii Nauk, 2020) -
On the Raşa Inequality for Higher Order Convex Functions
(Springer Nature, 2021)We study the following (q−1)th convex ordering relation for qth convolution power of the difference of probability distributions μ and ν (ν−μ)∗q≥(q−1)cx0,q≥2, and we obtain the theorem providing a useful sufficient ... -
Proper efficiency and duality for a new class of nonconvex multitime multiobjective variational problems
(Springer, 2014-09-02)In this paper, a new class of generalized of nonconvex multitime multiobjective variational problems is considered. We prove the sufficient optimality conditions for efficiency and proper efficiency in the considered ... -
Przyczyny i sposoby przeciwdziałania wykluczeniu cyfrowemu
(Wydawnictwo Naukowe Uniwersytetu Szczecińskiego, 2015)Rozwój technologii informacyjnych jest niewątpliwie jednym z najbardziej dynamicznie rozwijających się obszarów życia. W społeczeństwie powstają różnice między osobami, które posiadają dostęp do technologii informacyjnych, ... -
Quantum Sufficiency in the Operator Algebra Framework
(Springer, 2013-08-01)The paper is devoted to the investigation of the notion of sufficiency in quantum statistics. Three kinds of this notion are considered: plain sufficiency (called simply: sufficiency), Petz’s sufficiency, and Umegaki’s ... -
Stability of Nonlinear Dirichlet BVPs Governed by Fractional Laplacian
(Hindawi Publishing Corporation, 2014-03-02)We consider a class of partial differential equations with the fractional Laplacian and the homogeneous Dirichlet boundary data. Some sufficient condition under which the solutions of the equations considered depend ... -
State Determination and Sufficiency of Observables
(Springer, 2013-05-19)Informational completeness and the possibility of state distinction and determination are among the more important issues of quantum statistics. We use spectral and semispectral (POV) measures to analyse these questions. ... -
Stress and Anxiety Levels in Pregnant and Post-Partum Women during the COVID-19 Pandemic
(MDPI, 2020)The aim of this study was to analyze stress and anxiety levels experienced by pregnant and post-partum women during the COVID-19 pandemic, as well as to indicate the social and medical factors that could contribute to ...