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Suppose that an algebraic torus $G$ acts algebraically on a projective manifold $X$ with generically trivial stabilizers. Then the Zariski closure of the set of pairs $\{(x,y)\in X\times X\mid y=gx \text{for some}g\in G\}$ defines a nonzero…

Symplectic Geometry · Mathematics 2007-05-23 Ignasi Mundet-i-Riera

We prove the Zariski dense orbit conjecture in positive characteristic for regular self-maps of split semiabelian varieties.

Number Theory · Mathematics 2021-08-17 Dragos Ghioca , Sina Saleh

The k-Dirac operator is a differential operator which is natural to geometric structure of a parabolic type. We will give a set of initial conditions for this operator. In the proof of the claim we will need to adapt some parts from the…

Differential Geometry · Mathematics 2017-06-02 Tomas Salac

Let K be the subgroup of the extended mapping class group, Mod(S), generated by Dehn twists about separating curves. Assuming that S is a closed, orientable surface of genus at least 4, we confirm a conjecture of Farb that Comm(K), Aut(K)…

Geometric Topology · Mathematics 2014-11-11 Tara E Brendle , Dan Margalit

In this paper we prove some interpolation theorems for the multipliers of the Cauchy- Stiltjes type integrals

Complex Variables · Mathematics 2008-08-07 Peyo Stoilov

We establish the deformation theory of Lie groupoid morphisms, describe the corresponding deformation cohomology of morphisms, and show the properties of the cohomology. We prove its invariance under isomorphisms of morphisms. Additionally,…

Differential Geometry · Mathematics 2023-12-21 Cristian Camilo Cárdenas

We provide a simple unified approach to obtain (i) Discrete polygonal isoperimetric type inequalities of arbitrary high order. (ii) Arbitrary high order isoperimetric type inequalities for smooth curves, where both upper and lower bounds…

Classical Analysis and ODEs · Mathematics 2023-12-27 Kwok-Kun Kwong

We study the tropicalizations of analytic subvarieties of normal toric varieties over complete non-archimedean valuation fields. We show that a Zariski closed analytic subvariety of a normal toric variety is algebraic if its tropicalization…

Algebraic Geometry · Mathematics 2018-11-27 Ryota Mikami

In this brief note, we show that every smooth toric variety over the field of complex numbers is an Oka manifold.

Algebraic Geometry · Mathematics 2013-10-16 Finnur Larusson

We show that the counting of rational curves on a complete toric variety that are in general position to the toric prime divisors coincides with the counting of certain tropical curves. The proof is algebraic-geometric and relies on…

Algebraic Geometry · Mathematics 2007-05-23 Takeo Nishinou , Bernd Siebert

Let $X$ be a regular scheme over $\textrm{Spec}(\mathbb{Z}[1/p])$ where $p$ is prime. Let $i:Y\to X$ be a closed subscheme of pure codimension $r$. Let $n$ be a natural number prime to $p$. Let $\Lambda$ be a finite $\mathbb{Z}/n$-module…

Algebraic Geometry · Mathematics 2024-08-06 Amine Koubaa

The goal of this paper is to introduce the notion of polyconvolution for Fourier-cosine, Laplace integral operators, and its applications. The structure of this polyconvolution operator and associated integral transforms are investigated in…

Classical Analysis and ODEs · Mathematics 2023-12-04 Trinh Tuan

A theorem of Delzant states that any symplectic manifold $(M,\om)$ of dimension $2n$, equipped with an effective Hamiltonian action of the standard $n$-torus $\T^n = \R^{n}/2\pi\Z^n$, is a smooth projective toric variety completely…

Differential Geometry · Mathematics 2007-05-23 Miguel Abreu

Let $\A$ and $\B$ be operator algebras with $c_0$-isomorphic diagonals and let $\K$ denote the compact operators. We show that if $\A\otimes\K$ and $\B\otimes\K$ are isometrically isomorphic, then $\A$ and $\B$ are isometrically isomorphic.…

Operator Algebras · Mathematics 2023-06-22 Evgenios Kakariadis , Elias Katsoulis , Xin Li

In this work we prove that, for a general polyhedral domain of $\mathbb{R}^3$, the cohomology spaces of the discrete de Rham complex of [Di Pietro and Droniou, An arbitrary-order discrete de Rham complex on polyhedral meshes: Exactness,…

Numerical Analysis · Mathematics 2023-05-25 Daniele A. Di Pietro , Jérôme Droniou , Silvano Pitassi

We consider generalised Dirac--Schr\"odinger operators, consisting of a self-adjoint elliptic first-order differential operator D with a skew-adjoint 'potential' given by a (suitable) family of unbounded operators. The index of such an…

K-Theory and Homology · Mathematics 2025-01-29 Koen van den Dungen

In this paper, we prove two Kastler-Kalau-Walze type theorems for conformal perturbations of twisted Dirac operators and conformal perturbations of twisted signature operators on four-dimensional manifolds with (resp. without) boundary.

Differential Geometry · Mathematics 2021-08-21 Jian Wang , Yong Wang

In this paper, we study Hamiltonian R-actions on symplectic orbifolds [M/S], where R and S are tori. We prove an injectivity theorem and generalize Tolman-Weitsman's proof of the GKM theorem in this setting. The main example is the…

Symplectic Geometry · Mathematics 2012-06-13 Tara Holm , Tomoo Matsumura

We consider the symplectic vortex equations for a linear Hamiltonian torus action. We show that the associated genus zero moduli space itself is homotopic (in the sense of a homotopy of regular G-moduli problems) to a toric manifold with…

Symplectic Geometry · Mathematics 2008-12-02 Jan Wehrheim

We study toric orbifolds of real dimension four with vanishing odd-degree cohomology and obtain a basis for its degree-two equivariant cohomology with integral coefficients by identifying it with the intersection of certain lattices. As…

Algebraic Topology · Mathematics 2026-04-06 Tseleung So , Jongbaek Song