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In this paper, we give a characterization of compact sets in $L^p$-spaces on metric measure spaces, which is a generalization of the Kolmogorov-Riesz theorem. Using the criterion, we investigate the topological type of the space consisting…

General Topology · Mathematics 2022-09-27 Katsuhisa Koshino

Rank-one symmetric spaces carry a solvable group model which have a generalization to a larger class of Lie groups that are one-dimensional extensions of nilpotent groups. By examining some metric properties of these symmetric spaces, we…

Differential Geometry · Mathematics 2021-02-25 Brendan Burns Healy

We provide a characterization of r-regular sets in terms of the Lipschitz regularity of normal vector fields to the boundary.

Differential Geometry · Mathematics 2014-02-20 Pedro Duarte , Maria Joana Torres

The intent of this short note is to extend real valued Lipschitz functions on metric spaces, while locally preserving the asymptotic Lipschitz constant. We then apply this results to give a simple and direct proof of the fact that Sobolev…

Differential Geometry · Mathematics 2020-07-21 Simone Di Marino , Nicola Gigli , Aldo Pratelli

We consider the Rademacher- and Sobolev-to-Lipschitz-type properties for arbitrary quasi-regular strongly local Dirichlet spaces. We discuss the persistence of these properties under localization, globalization, transfer to weighted spaces,…

Metric Geometry · Mathematics 2025-09-26 Lorenzo Dello Schiavo , Kohei Suzuki

We give a condition on the curvature tensors of Riemannian manifolds that admit Lipschitz approximation by polyhedral metrics with curvature bounded below or above. We show that this condition is also sufficient for the existence of local…

Differential Geometry · Mathematics 2022-07-18 Anton Petrunin

Suppose that S is a left amenable semitopological semigroup. We prove that if ${T_{t}: t \in S}$ is a uniformly k-Lipschitzian semigroup on a bounded closed and convex subset C of a Hilbert space and $k<\sqrt{2}$, then the set of fixed…

Functional Analysis · Mathematics 2015-11-24 Andrzej Wiśnicki

This paper addresses Lipschitzian stability issues that play an important role in both theoretical and numerical aspects of variational analysis, optimization, and their applications. We particularly concentrate on the so-called relaxed…

Functional Analysis · Mathematics 2019-02-27 Andrew C. Eberhard , Boris S. Mordukhovich , Janosch Rieger

To minimize or upper-bound the value of a function "robustly", we might instead minimize or upper-bound the "epsilon-robust regularization", defined as the map from a point to the maximum value of the function within an epsilon-radius. This…

Optimization and Control · Mathematics 2010-06-10 Adrian S. Lewis , C. H. Jeffrey Pang

We show that the de Rham Hilbert complex with mixed boundary conditions on bounded strong Lipschitz domains is closed and compact. The crucial results are compact embeddings which follow by abstract arguments using functional analysis…

Analysis of PDEs · Mathematics 2022-03-14 Dirk Pauly , Michael Schomburg

This paper proposes that Lipschitz continuity is a natural outcome of regularized least squares in kernel-based learning. Lipschitz continuity is an important proxy for robustness of input-output operators. It is also instrumental for…

Optimization and Control · Mathematics 2021-12-08 Henk J. van Waarde , Rodolphe Sepulchre

The present paper is focused on the computation of the Lipschitz upper semicontinuity modulus of the feasible set mapping in the context of fully perturbed linear inequality systems; i.e., where all coefficients are allowed to be perturbed.…

Optimization and Control · Mathematics 2025-05-06 Jesús Camacho , María Josefa Cánovas , Helmut Gfrerer , Juan Parra

This paper deals with the Lipschitz regularity of minimizers for a class of variational obstacle problems with possible occurance of the Lavrentiev phenomenon. In order to overcome this problem, the availment of the notions of relaxed…

Analysis of PDEs · Mathematics 2021-02-26 Giacomo Bertazzoni , Samuele Riccò

In this paper we study some results on common fixed points of families of mappings on metric spaces by imposing orbit Lipschitzian conditions on them. These orbit Lipschitzian conditions are weaker than asking the mappings to be…

Functional Analysis · Mathematics 2023-06-27 Rafael Espínola , Maria Japón , Daniel Souza

We shall study in this paper the Lipschitz type stabilities and convergence rates of Tikhonov regularization for the recovery of the radiativities in elliptic and parabolic systems with Dirichlet boundary conditions. The Lipschitz type…

Analysis of PDEs · Mathematics 2020-08-26 De-Han Chen , Daijun Jiang , Jun Zou

In this paper we provide an up-to-date survey on the study of Lipschitz equivalence of self-similar sets. Lipschitz equivalence is an important property in fractal geometry because it preserves many key properties of fractal sets. A…

Metric Geometry · Mathematics 2013-03-05 Hui Rao , Huo-Jun Ruan , Yang Wang

We study a variant of the Whitney extension problem for the space $C^{k,\omega}(R^n)$. We identify this space with a space of Lipschitz mappings from $R^n$ into the space $P_k \times R^n$ of polynomial fields on $R^n$ equipped with a…

Functional Analysis · Mathematics 2007-05-23 Pavel Shvartsman

We give a sufficient condition for a metric (homology) manifold to be locally bi-Lipschitz equivalent to an open subset in $\rn$. The condition is a Sobolev condition for a measurable coframe of flat 1-forms. In combination with an earlier…

Metric Geometry · Mathematics 2011-03-17 Juha Heinonen , Stephen Keith

Certain solvable extensions of $H$-type groups provide noncompact counterexamples to the so-called Lichnerowicz conjecture, which asserted that ``harmonic'' Riemannian spaces must be rank 1 symmetric spaces.

Differential Geometry · Mathematics 2009-09-25 Ewa Damek , Fulvio Ricci

In this paper, the Lipschitz clustering property of a metric space refers to the existence of Lipschitz retractions between its finite subset spaces. Obstructions to this property can be either topological or geometric features of the…

Metric Geometry · Mathematics 2022-12-20 Leonid V. Kovalev