Results 71 to 80 of about 500,094 (203)
Solvability conditions for some difference operators
Advances in Difference Equations, 2005 Infinite-dimensional difference operators are studied. Under the assumption that the coefficients of the operator have limits at infinity, limiting operators and associated polynomials are introduced.
V. A. Volpert, N. C. Apreutesei
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International Journal of Mathematics and Mathematical Sciences, 1990 In this note we prove the existence of operators which are not Tauberian even though they satisfy properties about restrictions being Tauberian. The operators are defined on Banach spaces which contain a somewhat reflexive, non-reflexive subspace.
Jesús Araujo, J. Martinez-Maurica
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Factorization of Fredholm operators in operator algebras
Matematychni Studii, 2004 zbMATH Open Web Interface contents unavailable due to conflicting licenses.
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International Journal of Social Welfare, Volume 35, Issue 3, July 2026.Abstract Previous research has reported mental health disparities between truant and non‐truant adolescents. However, it remains unclear how social support is associated with mental health outcomes across different levels of truancy. We investigate whether social support has similar mental health benefits for all truant adolescents or whether it plays ...
Gökhan Kaya, Miia Bask
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A general theory of inverse welfare functions
Theoretical Economics, Volume 21, Issue 3, Page 973-1018, July 2026.This paper develops a general theory to recover the inverse welfare function that rationalizes a given tax schedule as optimal. Our theory allows for complex environments including the presence of multidimensional tax schedules, bunching/jumping behavior, optimization frictions, general equilibrium effects, and externalities.
Katy Bergstrom, William Dodds
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Perturbing Fredholm operators to obtain invertible operators [PDF]
, 1975 A condition is given on a set Ol of operators on Hilbert space that guarantees it has the following property: For any Fredholm operator T of index zero there exists an AϵA such that T + ϵA is invertible for all sufficiently small nonzero ϵ.
Widom, Harold
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On classes of Fredholm type operators
FilomatGiven an idempotent p in a Banach algebra and following the study in [6] of p-invertibility, we consider here left p-invertibility, right p-invertibility and p-invertibility in the Calkin Algebra C(X), where X is a Banach space. Then we define and study left and right generalized Drazin invertibility and we characterize left and right Drazin invertible
Hamdan, Alaa, Berkani, Mohammed
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Building a Digital Twin for Material Testing: Model Reduction and Data Assimilation
Proceedings in Applied Mathematics and Mechanics, Volume 26, Issue 2, June 2026.ABSTRACT The rapid advancement of industrial technologies, data collection, and handling methods has paved the way for the widespread adoption of digital twins (DTs) in engineering, enabling seamless integration between physical systems and their virtual counterparts.
Rubén Aylwin +5 more
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Coulomb branch algebras via symplectic cohomology
Journal of Topology, Volume 19, Issue 2, June 2026.Abstract Let (M¯,ω)$(\bar{M}, \omega)$ be a compact symplectic manifold with convex boundary and c1(TM¯)=0$c_1(T\bar{M})=0$. Suppose that (M¯,ω)$(\bar{M}, \omega)$ is equipped with a convex Hamiltonian G$G$‐action for some connected, compact Lie group G$G$.
Eduardo González +2 more
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Cubo, 2010 We will present sufficient conditions for the Fredholm property of Wiener-Hopf plus and minus Hankel operators with different Fourier matrix symbols in the C*-algebra of semialmost periodic elements.
L. P Castro, A. S. Silva
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