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We consider four dimensional Lie groups with left-invariant Riemannian metrics. For such groups we classify left-invariant conformal foliations with minimal leaves of codimension two. These foliations produce local complex-valued harmonic…

Differential Geometry · Mathematics 2015-06-17 Sigmundur Gudmundsson , Martin Svensson

Answering a question of Frank Calegari, we extend some of our earlier results on dimension of fixed point spaces of elements in irreducible linear groups. We consider characteristic polynomials rather than just fixed spaces.

Group Theory · Mathematics 2011-12-21 Robert Guralnick , Gunter Malle

We show that codimension one distributions with at most isolated singularities on certain smooth projective threefolds with Picard rank one have stable tangent sheaves. The ideas in the proof of this fact are then applied to the…

Algebraic Geometry · Mathematics 2020-04-20 Omegar Calvo-Andrade , Maurício Corrêa , Marcos Jardim

This preliminary report contains a sketch of the proof of the following result: a slowly divergent Teichmuller geodesic satisfying a certain logarithmic law is determined by a uniquely ergodic measured foliation.

Dynamical Systems · Mathematics 2007-05-23 Yitwah Cheung , Alex Eskin

We introduce in this paper a hypercohomology version of the resonance varieties and obtain some relations to the characteristic varieties of rank one local systems on a smooth quasi-projective complex variety $M$, see Theorem (3.1) and…

Algebraic Geometry · Mathematics 2019-02-20 Alexandru Dimca

Fractional derivative and delay are important tools in modeling memory properties in the natural system. This work deals with the stability analysis of a fractional order delay differential equation \begin{equation*} D^\alpha x(t)=\delta…

Dynamical Systems · Mathematics 2022-08-29 Sachin Bhalekar , Deepa Gupta

We prove that some of the classical homological stability results for configuration spaces of points in manifolds can be lifted to motivic cohomology.

Algebraic Topology · Mathematics 2023-04-11 Geoffroy Horel , Martin Palmer

In this article we investigate the regularity properties of linear degenerations of flag varieties. We classify the linear degenerations of (partial) flag varieties that are smooth. Furthermore, we study the singular locus of irreducible…

Algebraic Geometry · Mathematics 2025-08-01 Sabino Di Trani

We prove that the ith graded pieces of the Orlik-Solomon algebras or Cordovil algebras of resonance arrangements form a finitely generated FS^op-module, thus obtaining information about the growth of their dimensions and restrictions on the…

Combinatorics · Mathematics 2020-11-23 Eric Ramos , Nicholas Proudfoot

We introduce an arbitrary order, stabilized finite element method for solving a unique continuation problem subject to the time-harmonic elastic wave equation with variable coefficients. Based on conditional stability estimates we prove…

Numerical Analysis · Mathematics 2023-04-25 Erik Burman , Janosch Preuss

This paper is devoted to stability results for the Gaussian logarithmic Sobolev inequality, with explicit stability constants.

Analysis of PDEs · Mathematics 2024-07-11 Giovanni Brigati , Jean Dolbeault , Nikita Simonov

This paper introduces the concept of dimensional stability for spline spaces over T-meshes, providing the first mathematical definition and a preliminary classification framework. We define dimensional stability as an invariant within the…

Numerical Analysis · Mathematics 2025-08-11 Bingru Huang , Falai Chen

We produce examples of codimension one foliations of the Euclidean and hyperbolic planes with bounded geometry which are topologically products, but for which leaves are non-recursively distorted. That is, the function which compares…

Geometric Topology · Mathematics 2007-05-23 Danny Calegari

In this paper, we study the volume of algebraically integrable foliations and locally stable families. We show that, for any canonical algebraically integrable foliation, its volume belongs to a discrete set depending only on its rank and…

Algebraic Geometry · Mathematics 2024-06-25 Jingjun Han , Junpeng Jiao , Mengchu Li , Jihao Liu

We prove that generically in $\text{Diff}^{1}_{m}(M)$, if an expanding $f$-invariant foliation $W$ of dimension $u$ is minimal and there is a periodic point of unstable index $u$, the foliation is stably minimal. By this we mean there is a…

Dynamical Systems · Mathematics 2020-05-15 Gabriel Nuñez , Jana Rodriguez Hertz

We study first-order logic over unordered structures whose elements carry a finite number of data values from an infinite domain which can be compared wrt. equality. As the satisfiability problem for this logic is undecidable in general, in…

Logic in Computer Science · Computer Science 2022-09-22 Benedikt Bollig , Arnaud Sangnier , Olivier Stietel

We explore the integration of representations from a Lie algebra to its algebraic group in positive characteristic. An integrable module is stable under the twists by group elements. Our aim is to investigate cohomological obstructions for…

Representation Theory · Mathematics 2019-10-30 Dmitriy Rumynin , Matthew Westaway

In this article, we give the structure of codimension one foliations with canonical singularities and numerically trivial canonical class on varieties with klt singularities. Building on recent works of Spicer, Cascini - Spicer and Spicer -…

Algebraic Geometry · Mathematics 2020-08-07 Stéphane Druel , Wenhao Ou

Let $F/\mathbb{Q}_p$ be finite and let $\mathfrak{X}_G$ be the moduli space of Langlands parameters valued in $G$, in characteristic distinct from $p$. First, we determine the irreducible components of $\mathfrak{X}_G$. Then, we determine…

Number Theory · Mathematics 2023-12-06 Jack Shotton

In the paper we extent the notion of Dobrushin coefficient of ergodicity for positive contractions defined on $L^1$-space associated with finite von Neumann algebra, and in terms of this coefficient we prove stability results for…

Operator Algebras · Mathematics 2007-05-23 Farrukh Mukhamedov , Hasan Akin , Seyit Temir