Article
Mathematics
Alberto Enciso, Niky Kamran
Summary: This paper deals with the existence of local isometric embeddings for analytic Riemannian metrics on a subset of R-n, which are singular at an isolated point. It shows the existence of a local analytic isometric embedding into Euclidean space under certain technical assumptions, extending the classical Cartan-Janet Theorem to the singular setting. The proof utilizes Leray's ramified Cauchy-Kovalevskaya Theorem for analytic differential systems.
JOURNAL OF DIFFERENTIAL EQUATIONS
(2021)
Article
Mathematics
Aaron Brown, Danijela Damjanovic, Zhiyuan Zhang
Summary: This paper studies Zimmer's conjecture for C-1 actions of lattice subgroup of a higher-rank simple Lie group with finite center on compact manifolds. It is shown that when the rank of a uniform lattice is larger than the dimension of the manifold, the action factors through a finite group. The dimensional bound is sharp for lattices in SL(n, R).
COMPOSITIO MATHEMATICA
(2022)
Article
Mathematics
Konstantinos Tsouvalas
Summary: This article presents examples of quasi-isometric embeddings of word hyperbolic groups into SL(d,R) for d >= 4, which are not limits of Anosov representations into SL(d,R). Consequently, it is concluded that an analogue of the density theorem for PSL(2,C) does not hold for SL(d, R) when d >= 4.
JOURNAL OF THE INSTITUTE OF MATHEMATICS OF JUSSIEU
(2023)
Article
Mathematics
Xiaobing Sheng
Summary: This article introduces the generalized Thompson's groups defined by Brown and the quasi-isometric embedding theorems found by Burillo, Cleary, and Stein. It shows that there exists a quasi-isometric embedding from Tn to T2 for any n > 2, but no embeddings from T2 to Tn for n > 3.
TOKYO JOURNAL OF MATHEMATICS
(2022)
Article
Mathematics
Sam Shepherd, Daniel J. Woodhouse
Summary: In this paper, we study the quasi-isometric rigidity of a class of groups that can be decomposed into graphs of groups with virtually free vertex groups and two-ended edge groups. Our main result states that any group quasi-isometric to a certain group G is abstractly commensurable to G, given that G is one-ended, hyperbolic relative to virtually abelian subgroups, and has a JSJ decomposition over two-ended subgroups containing only virtually free vertex groups that are not quadratically hanging. Our result also applies to certain generic HNN extensions of a free group over cyclic subgroups.
JOURNAL FUR DIE REINE UND ANGEWANDTE MATHEMATIK
(2022)
Article
Mathematics
A. Minasyan, D. Osin, S. Witzel
Summary: This study uses basic tools of descriptive set theory to prove that a closed set S of marked groups has 2 aleph 0 quasi-isometry classes, and further analyzes the perfect sets of marked groups with dense subsets of finitely presented groups. The results account for most known constructions of continuous families of non-quasi-isometric finitely generated groups, and show the existence of 2 aleph 0 quasi-isometry classes of finitely generated groups with interesting algebraic, geometric, or model-theoretic properties.
JOURNAL OF TOPOLOGY
(2021)
Article
Mathematics, Applied
Yanga Bavuma, Francesco G. Russo
Summary: This research shows that locally compact abelian p-groups can be embedded in the first Hawaiian group on a compact path connected subspace of the Euclidean space of dimension four, providing a new geometric interpretation for the classification of locally compact abelian groups rich in commuting closed subgroups. By introducing the idea of algebraic topology for topologically modular locally compact groups through the geometry of the Hawaiian earring, applications for locally compact groups that are noncompact are found.
FORUM MATHEMATICUM
(2022)
Article
Mathematics, Applied
Guy c. David, S. Y. L. V. E. S. T. E. R. Eriksson-bique, V. Y. R. O. N. Vellis
Summary: This paper proves that a quasiconformal tree can be bi-Lipschitz embedded in some Euclidean space, with the ambient dimension and the bi-Lipschitz constant depending only on the doubling and bounded turning constants of the tree.
PROCEEDINGS OF THE AMERICAN MATHEMATICAL SOCIETY
(2023)
Article
Mathematics
Michael Brandenbursky, Michal Marcinkowski
Summary: The paper introduces a new method for constructing classes in bounded cohomology of transformation groups, as well as properties of certain manifold groups. It also demonstrates that for many manifolds, the bounded cohomology of these groups is infinite dimensional.
MATHEMATISCHE ANNALEN
(2022)
Article
Mathematics, Applied
Joseph Berleant, Kristin Sheridan, Anne Condon, Virginia Vassilevska Williams, Mark Bathe
Summary: A mapping alpha: V(G) -> V(H) from the vertex set of graph G to graph H is an isometric embedding if the shortest path distance between any two vertices in G equals the distance between their images in H. We partition every Hamming embedding of G into a canonical partition using the Cartesian product decomposition of G called its canonical isometric representation, and the parts of the canonical partition provide Hamming embeddings for each factor of G's canonical isometric representation. This implies that G permits a Hamming embedding if and only if each factor of its canonical isometric representation is Hamming embeddable.
DISCRETE APPLIED MATHEMATICS
(2023)
Article
Mathematics
Ilia Kirillov
Summary: This article focuses on the classification of generic coadjoint orbits for symplectomorphism groups of compact symplectic surfaces with or without boundary. It also classifies simple Morse functions on such surfaces up to a symplectomorphism.
INTERNATIONAL MATHEMATICS RESEARCH NOTICES
(2023)
Article
Mathematics, Applied
Rui Liu, Jifu Yin
Summary: In this paper, we introduce and study the quasi-Holder mappings between unit spheres of p-normed spaces. The quasi-Holder map is a natural generalization of the Holder map, Lipschitz map, quasi-isometry and e-isometry, etc. We study the extension of a quasi-Holder embedding between unit spheres of p-normed spaces (0 < p <= 1) under the quasi-Holder or anti-Holder type assumption. We generalize the main results in Xiao and Lu (Ann Funct Anal 13(2):Paper No. 25, 2022) from the r-isometric case to the wider case of quasi-Holder mappings. Moreover, we adopt a different method and remove the Hahn-Banach property as a condition in our results.
ANNALS OF FUNCTIONAL ANALYSIS
(2023)
Article
Mathematics, Applied
Sheldon Dantas, Ruben Medina, Andres Quilis, Oscar Roldan
Summary: In this paper, an infinite metric space M is introduced where the set of strongly norm-attaining Lipschitz functions on M does not contain a subspace which is linear isometric to c0. This paper answers a question posed by Antonio Aviles, Gonzalo Martinez-Cervantes, Abraham Rueda Zoca, and Pedro Tradacete. It is also proven that the set contains an isometric copy of c0 whenever M is an infinite metric space that is not uniformly discrete.
NONLINEAR ANALYSIS-THEORY METHODS & APPLICATIONS
(2023)
Article
Mathematics
Thang Nguyen
Summary: The study focuses on quasi-isometric embeddings of symmetric spaces and non-uniform irreducible lattices in semi-simple higher rank Lie groups, showing that any quasi-isometric embedding between symmetric spaces of the same rank can be decomposed into a product of quasi-isometric embeddings into irreducible symmetric spaces. It extends earlier rigidity results about quasi-isometric embeddings to the setting of semi-simple Lie groups and provides examples where rigidity does not hold, including cases where every flat is mapped into multiple flats.
GEOMETRIAE DEDICATA
(2021)
Article
Mathematics, Applied
Xu Sun, Peter Topalov
Summary: We propose a framework for studying quasi-periodic maps and diffeomorphisms on R-n. As an application, we prove the local well-posedness of the Euler equation in a space of quasi-periodic vector fields on R-n. Specifically, the equation preserves the spatial quasi-periodicity of the initial data. Several results on the analytic dependence of solutions on the time and initial data are demonstrated.
JOURNAL OF MATHEMATICAL FLUID MECHANICS
(2023)
Article
Mathematics
Michael Brandenbursky, Jarek Kedra
ALGEBRAIC AND GEOMETRIC TOPOLOGY
(2015)
Article
Mathematics
Michael Brandenbursky, Swiatoslaw R. Gal, Jarek Kedra, Michal Marcinkowski
GLASGOW MATHEMATICAL JOURNAL
(2016)
Article
Mathematics
Michael Brandenbursky
INTERNATIONAL JOURNAL OF MATHEMATICS
(2015)
Article
Mathematics
Michael Brandenbijrsky, Egor Shelukhin
MATHEMATICAL RESEARCH LETTERS
(2015)
Article
Mathematics, Applied
Michael Brandenbursky
TOPOLOGY AND ITS APPLICATIONS
(2016)
Article
Mathematics
Michael Brandenbursky, Egor Shelukhin
GEOMETRY & TOPOLOGY
(2017)
Article
Mathematics
Michael Brandenbursky, Egor Shelukhin
GEOMETRY & TOPOLOGY
(2017)
Article
Mathematics, Applied
Michael Brandenbursky, Jarek Kedra, Egor Shelukhin
COMMUNICATIONS IN CONTEMPORARY MATHEMATICS
(2018)
Article
Mathematics
Michael Brandenbursky, Jarek Kedra
ALGEBRAIC AND GEOMETRIC TOPOLOGY
(2013)
Article
Mathematics
Michael Brandenbursky
GEOMETRIAE DEDICATA
(2014)
Article
Mathematics
Michael Brandenbursky
JOURNAL OF KNOT THEORY AND ITS RAMIFICATIONS
(2013)
Article
Mathematics, Applied
Michael Brandenbursky
TOPOLOGY AND ITS APPLICATIONS
(2014)
Article
Mathematics
Michael Brandenbursky
JOURNAL OF TOPOLOGY AND ANALYSIS
(2012)
Article
Mathematics
Michael Brandenbursky, Jarek Kedra
ANNALES MATHEMATIQUES DU QUEBEC
(2017)