Results 91 to 100 of about 1,370 (227)

Scattering theory for difference equations with operator coefficients

Journal of the London Mathematical Society, Volume 113, Issue 3, March 2026.
Abstract We investigate a class of second‐order difference equations featuring operator‐valued coefficients with the aim of approaching problems of stationary scattering theory. We focus on various compact perturbations of the discrete Laplacian given in a Hilbert space of bi‐infinite square‐summable sequences with entries from a fixed Hilbert space ...
David Sher, Luis Silva, Boris Vertman, Monika Winklmeier   +3 more
wiley   +1 more source

Closed equivalence relations on compact spaces and pairs of commutative C*-algebras: a Categorical Approach

Visnik Harkivsʹkogo Nacionalʹnogo Universitetu im. V.N. Karazina. Cepiâ Matematika, Prikladna Matematika i Mehanika
In this paper, we study a categorical extension of the classical Gelfand-Naimark duality between compact Hausdorff spaces and commutative unital C*-algebras.
Роман Скуріхін, Сергій Гефтер, Євген Каролінський   +2 more
doaj   +1 more source

Self-Adjoint Extension of Symmetric Maps

, 2011
3 ...
openaire   +2 more sources

Assembly of constructible factorization algebras

Journal of Topology, Volume 19, Issue 1, March 2026.
Abstract We provide a toolbox of extension, gluing, and assembly techniques for factorization algebras. Using these tools, we fill various gaps in the literature on factorization algebras on stratified manifolds, the main one being that constructible factorization algebras form a sheaf of symmetric monoidal ∞$\infty$‐categories.
Eilind Karlsson, Claudia I. Scheimbauer, Tashi Walde   +2 more
wiley   +1 more source

Extension of an existence theorem for a non-self-adjoint linear system [PDF]

, 1921
H. J. Ettlinger
openalex   +1 more source

Multi‐Scale Electrical Conductivity Model of the Contiguous United States

Geophysical Research Letters, Volume 53, Issue 4, 28 February 2026.
Abstract The completion of the Magnetotelluric (MT) USArray across the contiguous US enables continental‐scale 3‐D imaging of the asthenosphere‐lithosphere electrical structure. We present a novel 3‐D model of the contiguous United States (MECMUS), derived from a single inversion of the now‐completed USMTArray data set.
Federico D. Munch, Alexander Grayver
wiley   +1 more source

Integral representations of solutions of coercive solvable problems for the Laplace equation

Boundary Value Problems
Modeling of many stationary physical processes is reduced to the study of boundary value problems for elliptic equations. Starting with the works of A.V. Bitsadze and A.A. Samarskiy, well-posed, but not necessarily boundary value problems for the Laplace
Tynysbek Kal’menov
doaj   +1 more source

Non-Friedrichs Self-adjoint extensions of the Laplacian in R^d [PDF]

, 2011
Paul Lin
openalex   +1 more source

J-self-adjoint operators with \mathcal{C} -symmetries: an extension theory approach [PDF]

, 2009
S Albeverio, U Günther, S Kuzhel
openalex   +1 more source