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We present a short and self-contained proof of the extension property for partial isometries of the class of all finite metric spaces.

Combinatorics · Mathematics 2025-10-01 Jan Hubička , Matěj Konečný , Jaroslav Nešetřil

We use the theory of Harbater-Katz-Gabber curves to derive a generalization of the Hasse-Arf theorem for complete local field extensions in positive characteristic.

Algebraic Geometry · Mathematics 2023-12-21 Ioannis Tsouknidas

The properties of the Riemann extensions of nonriemannian spaces defined by the first order systems of differential equations are considered.

Differential Geometry · Mathematics 2007-05-23 Dryuma Valerii

An infinite dimensional algebra, which is useful for deriving exact solutions of the generalized pairing problem, is introduced. A formalism for diagonalizing the corresponding Hamiltonian is also proposed. The theory is illustrated with…

Quantum Physics · Physics 2008-02-03 Feng Pan , J. P. Draayer

In a previous work, "compact versions" of Rubio de Francia's weighted extrapolation theorem were proved, which allow one to extrapolate the compactness of an linear operator from just one space to the full range of weighted Lebesgue spaces,…

Functional Analysis · Mathematics 2022-06-24 Stefanos Lappas

A sequence of generalizations of Cartan's conservation of torsion theorem is given for n-dimensional differentiable manifolds having a general linear connection.

General Relativity and Quantum Cosmology · Physics 2016-08-31 C. C. Briggs

For a complete Riemannian manifold $M$ with an (1,1)-elliptic Codazzi self-adjoint tensor field $A$ on it, we use the divergence type operator ${L_A}(u): = div(A\nabla u)$ and an extension of the Ricci tensor to extend some major comparison…

Differential Geometry · Mathematics 2019-02-13 S. H. Fatemi , S. Azami

We prove a generalized Fej\'er's theorem for locally compact groups.

Classical Analysis and ODEs · Mathematics 2017-02-21 Huichi Huang

We give a simple proof of Dorronsoro's theorem and use similar ideas to establish an equivalence for embeddings of vector fields.

Classical Analysis and ODEs · Mathematics 2015-06-23 Dmitriy Stolyarov

We give necessary and sufficient conditions for the convergence with geometric rate of the denominators of linear Pad\'e-orthogonal approximants corresponding to a measure supported on a general compact set in the complex plane. Thereby, we…

Complex Variables · Mathematics 2014-11-27 N. Bosuwan , G. López Lagomasino

We introduce and study $\alpha$-embedded sets and apply them to generalize the Kuratowski Extension Theorem.

General Topology · Mathematics 2014-07-24 Olena Karlova

The paragrassmann calculus proposed earlier is applied to constructing paraconformal transformations and paragrassmann generalizations of the Virasoro-Neveu-Schwarz-Ramond algebras.

High Energy Physics - Theory · Physics 2009-10-22 A. T. Filippov , A. P. Isaev , A. B. Kurdikov

We characterize and describe the extensions of expansive and Anosov homeomorphisms on compact spaces. As an application we obtain a stability result for extensions of Anosov systems, and show a construction that embeds any expansive system…

Dynamical Systems · Mathematics 2020-11-17 Mauricio Achigar

In this exposition we discuss the theory of algebraic extensions of valued fields. Our approach is mostly through Galois theory. Most of the results are well-known, but some are new. No previous knowledge on the theory of valuations is…

Commutative Algebra · Mathematics 2014-04-16 Michiel Kosters

The aim of this paper is to present an extension theorem for the functions separately holomorphic on generalized (N,k)-crosses with pluripolar singularities.

Complex Variables · Mathematics 2016-08-14 Małgorzata Zajęcka

We provide a sufficient condition for the continuous extension of isometries for the Kobayashi distance between bounded convex domains in complex Euclidean spaces having boundaries that are only slightly more regular than $\mathcal{C}^1$.…

Complex Variables · Mathematics 2021-12-28 Anwoy Maitra

The purpose of the present paper is to prove the Nakano theorem for orthogonally additive polynomials in Riesz spaces

Functional Analysis · Mathematics 2025-03-04 Elmiloud Chil , Khansa Weslati

The aim of the note is to extend the uniformization theorem to compact Kahler spaces X with mild singularities and establish a kind of rigidity of their universal coverings. We assume the fundamental group of X is large, residually finite…

Algebraic Geometry · Mathematics 2016-08-01 Robert Treger

We formulate a generalization of the extension problem for exact sequences which was considered in [SGA VII] and give a necessary and sufficient criterion for the solution to exist. We also remark on the criterion under which such a…

Category Theory · Mathematics 2017-04-17 Rakesh Pawar

Generalizing a theorem of Ph. Dwinger, we describe the partially ordered set of all (up to equivalence) zero-dimensional locally compact Hausdorff extensions of a zero-dimensional Hausdorff space. Using this description, we find the…

General Topology · Mathematics 2009-10-17 Georgi Dimov