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In this note we prove the Borel Conjecture for closed, irreducible and sufficiently collapsed three-dimensional Alexandrov spaces. We also pose several questions related to characterization of fundamental groups of three-dimensional…

Metric Geometry · Mathematics 2020-11-26 Noé Bárcenas , Jesús Núñez-Zimbrón

In this note we reconsider a familiar result in Vassiliev knot theory - that the coefficients of the Alexander-Conway polynomial determine the top row of the Kontsevich integral - from the point of view of Kazuo Habiro's clasper theory. We…

Geometric Topology · Mathematics 2007-05-23 Andrew Kricker

In this paper, we introduce quasi-convex subsets in Alxandrov spaces with lower curvature bound, which include not only all closed convex subsets without boundary but also all extremal subsets. Moreover, we explore several essential…

Metric Geometry · Mathematics 2020-06-02 Xiaole Su , Hongwei Sun , Yusheng Wang

We consider surfaces with constant mean curvature in certain warped product manifolds. We show that any such surface is umbilic, provided that the warping factor satisfies certain structure conditions. This theorem can be viewed as a…

Differential Geometry · Mathematics 2012-10-23 S. Brendle

We establish a half-space theorem \`a la Hoffman and Meeks for nonlocal minimal surfaces. Differently from the classical case, our result holds in every dimension.

Analysis of PDEs · Mathematics 2026-05-01 Matteo Cozzi , Jack Thompson

We establish a Liouville type theorem for fully nonlinear uniformly elliptic equations in exterior domains in half spaces under quadratic boundary data and a quadratic growth condition, that is, any viscosity solution tends to a quadratic…

Analysis of PDEs · Mathematics 2026-05-28 Dongsheng Li , Rulin Liu

This paper introduces proximal homotopic cycles, which lead to the main results in this paper, namely, extensions of the Mitsuishi-Yamaguchi Good Coverning Theorem with different forms of Tanaka good cover of an Alexandrov space equipped…

Algebraic Topology · Mathematics 2021-08-24 J. F. Peters , T. Vergili

The hyperbolicity statements for subvarieties and complements of hypersurfaces in abelian varieties admit arithmetic analogues, due to Faltings (and Vojta for the semi-abelian case). In Atti Accad. Naz. Lincei Rend. Lincei Mat. Appl. 29…

Complex Variables · Mathematics 2020-05-14 Pietro Corvaja , Junjiro Noguchi , Umberto Zannier

In this paper, an Alexandrov-Fenchel inequality is established for closed $2$-convex spacelike hypersurface in de Sitter space by investigating the behavior of the locally constrained inverse curvature flow \begin{align} \frac{\partial…

Differential Geometry · Mathematics 2025-12-19 Kuicheng Ma

We extend basic results in $3$-manifold topology to general three-dimensional Alexandrov spaces (or Alexandrov $3$-spaces for short), providing a unified framework for manifold and non-manifold spaces. We generalize the connected sum to…

We give two applications of the Aleksandrov-Bakelman-Pucci estimate to the Calabi-Yau equation on symplectic four-manifolds. The first is solvability of the equation on the Kodaira-Thurston manifold for certain almost-Kahler structures…

Differential Geometry · Mathematics 2018-06-15 Valentino Tosatti , Ben Weinkove

We study the categorical Torelli theorem for smooth (weighted) hypersurfaces in (weighted) projective spaces via the Hochschild--Serre algebra of its Kuznetsov component. In the first part of the paper, we show that a natural graded…

Algebraic Geometry · Mathematics 2024-10-22 Xun Lin , Jørgen Vold Rennemo , Shizhuo Zhang

We prove Alexander- and Markov-type theorems for virtual spatial trivalent graphs and virtual trivalent braids. We provide two versions for the Markov-type theorem: one uses an algebraic approach similar to the case of classical braids and…

Geometric Topology · Mathematics 2019-06-04 Carmen Caprau , Abigayle Dirdak , Rita Post , Erica Sawyer

The Jacobian ring J(X) of a smooth hypersurface determines its isomorphism type. This has been used by Donagi and others to prove the generic global Torelli theorem for hypersurfaces in many cases. In Voisin's original proof of the global…

Algebraic Geometry · Mathematics 2016-11-14 Daniel Huybrechts , Jørgen Rennemo

In this paper, we establish the existence of time quasi-periodic solutions to generalized surface quasi-geostrophic equation $({\rm gSQG})_\alpha$ in the patch form close to Rankine vortices. We show that invariant tori survive when the…

Analysis of PDEs · Mathematics 2021-11-17 Zineb Hassainia , Taoufik Hmidi , Nader Masmoudi

In this paper we use the new regularity and stability estimates for Alexandrov solutions to Monge-Ampere equations estabilished by G.De Philippis and A.Figalli to provide a global in time existence of distributional solutions to a…

Analysis of PDEs · Mathematics 2012-10-16 Luigi Ambrosio , Maria Colombo , Guido De Philippis , Alessio Figalli

This article generalizes the result of Katzarkov and Ramachandran from algebraic surfaces to K\"ahler surfaces. We follow their argument to prove the holomorphic convexity of a reductive Galois covering over a compact K\"ahler surface which…

Complex Variables · Mathematics 2023-03-14 Yuan Liu

In this paper, we complete the long-standing challenge to establish a Khintchine-type theorem for arbitrary nondegenerate manifolds in $\mathbb{R}^n$. In particular, our main result finally removes the analyticity assumption from the…

Number Theory · Mathematics 2025-05-05 Victor Beresnevich , Shreyasi Datta

Let $K/F$ be a finite Galois extension of number fields. It is well known that the Tchebotarev density theorem implies that an irreducible, finitely ramified $p$-adic representation $\rho$ of the absolute Galois group of $K$ is determined…

Number Theory · Mathematics 2018-06-25 Dinakar Ramakrishnan

Let $M_j$ be a sequence of Riemannian manifolds with sectional curvature bound below collapsing to a compact Alexandrov space $X$ of dimension $k$. Suppose that all but finitely many points of $X$ are $(k,\delta)$-strained and that the…

Differential Geometry · Mathematics 2023-01-18 Tadashi Fujioka