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We prove a strong non-structure theorem for a class of metric structures with an unstable pair of formulae. As a consequence, we show that weak categoricity (that is, categoricity up to isomorphisms and not isometries) implies several…

Logic · Mathematics 2019-08-20 Saharon Shelah , Alexander Usvyatsov

In this paper, for the first time in the literature, we study the stability of solutions of two classes of feasibility (i.e., split equality and split feasibility) problems by set-valued and variational analysis techniques. Our idea is to…

Optimization and Control · Mathematics 2024-10-23 Vu Thi Huong , Hong-Kun Xu , Nguyen Dong Yen

In this paper, we study planar polygonal curves from the variational methods. We show an unified interpretation of discrete curvatures and the Steiner-type formula by extracting the notion of the discrete curvature vector from the first…

Differential Geometry · Mathematics 2020-04-17 Yoshiki Jikumaru

We study the one-phase Alt-Phillips free boundary problem, focusing on the case of negative exponents $\gamma \in (-2,0)$. The goal of this paper is twofold. On the one hand, we prove smoothness of $C^{1,\alpha}$-regular free boundaries by…

Analysis of PDEs · Mathematics 2025-07-15 Matteo Carducci , Giorgio Tortone

We develop several aspects of local and global stability in continuous first order logic. In particular, we study type-definable groups and genericity.

Logic · Mathematics 2014-02-10 Itaï Ben Yaacov

We show that for any stable sheaf $E$ of slope $> 2g-1$ on a smooth, projective curve of genus $g$, the associated Picard sheaf $\hat{E}$ on the Picard variety of the curve is stable. We introduce a homological tool for testing…

Algebraic Geometry · Mathematics 2015-11-23 Georg Hein , David Ploog

We carry out a survey on curves defined over finite fields that are Diophantine stable; that is, with the property that the set of points of the curve is not altered under a proper field extension. First, we derive some general results of…

Number Theory · Mathematics 2025-05-14 Francesc Bars , Joan Carles Lario , Brikena Vruoni

We study the spaces of locally-finite stability conditions on the derived categories of coherent sheaves on the minimal resolutions of $A_n$-singularities supported at the exceptional sets. Our main theorem is that they are connected and…

Algebraic Geometry · Mathematics 2010-04-20 Akira Ishii , Kazushi Ueda , Hokuto Uehara

The article treats the classical problem of stability of steady rotation of a rigid homogeneous ellipsoid on a rigid smooth plane which rotates about its vertical axis. The condition for the steady rotation is derived from the Euler-Poisson…

Classical Physics · Physics 2007-05-23 Milan Batista

We use a random pinning procedure to investigate stable glassy states associated with large deviations of the activity in a model glass-former. We pin particles both from active (equilibrium) configurations and from stable (inactive) glassy…

Statistical Mechanics · Physics 2014-07-02 Christopher J. Fullerton , Robert L. Jack

We determine the stability conditions for a radially symmetric noncommutative scalar soliton at finite noncommutivity parameter $\theta$. We find an intriguing relationship between the stability and existence conditions for all level-1…

High Energy Physics - Theory · Physics 2010-02-03 Mark G. Jackson

We deal with the problem of determining an inclusion within an electrical conductor from electrical boundary measurements. Under mild a priori assumptions we establish an optimal stability estimate.

Analysis of PDEs · Mathematics 2007-05-23 Giovanni Alessandrini , Michele Di Cristo

This paper gives a description of the full space of Bridgeland stability conditions on the bounded derived category of a contraction algebra associated to a 3-fold flop. The main result is that the stability manifold is the universal cover…

Algebraic Geometry · Mathematics 2022-08-02 Jenny August , Michael Wemyss

We study stable rationality properties of conic bundles over rational surfaces.

Algebraic Geometry · Mathematics 2015-03-31 Brendan Hassett , Andrew Kresch , Yuri Tschinkel

We define and study a gluing procedure for Bridgeland stability conditions in the situation when a triangulated category has a semiorthogonal decomposition. As an application we construct stability conditions on the derived categories of…

Algebraic Geometry · Mathematics 2010-05-17 John Collins , Alexander Polishchuk

We study the linearized stability of n-vortex solutions of the magnetic Ginzburg-Landau (or Abelian-Higgs) equations. We prove that the fundamental vortices (n=1,-1) are stable for all values of the coupling constant, k, and we prove that…

Analysis of PDEs · Mathematics 2007-05-23 S. Gustafson , I. M. Sigal

A bar-joint framework $(G,p)$ in $\mathbb{R}^d$ is rigid if the only edge-length preserving continuous motions of the vertices arise from isometries of $\mathbb{R}^d$. It is known that, when $(G,p)$ is generic, its rigidity depends only on…

Combinatorics · Mathematics 2023-03-27 Georg Grasegger , Hakan Guler , Bill Jackson , Anthony Nixon

We study the well-posedness and asymptotic behaviour of selected PDE-PDE and PDE-ODE systems on one-dimensional spatial domains, namely a boundary coupled wave-heat system and a wave equation with a dynamic boundary condition. We prove…

Analysis of PDEs · Mathematics 2023-03-01 Lassi Paunonen

We give simple and unified proofs of the known stability and rigidity results for Lie algebras, Lie subalgebras and Lie algebra homomorphisms. Moreover, we investigate when a Lie algebra homomorphism is stable under all automorphisms of the…

Representation Theory · Mathematics 2013-07-31 Marius Crainic , Florian Schaetz , Ivan Struchiner

This paper is devoted to considering the following Hardy-Sobolev inequality \[ \int_{\mathbb{R}^N}|\nabla u|^p \mathrm{d}x \geq \mathcal{S}_\beta\left(\int_{\mathbb{R}^N}\frac{|u|^{p^*_\beta}}{|x|^{\beta}}…

Analysis of PDEs · Mathematics 2023-01-19 Shengbing Deng , Xingliang Tian