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We study the structure of the smooth manifold which is defined as the intersection of a stable manifold and an unstable manifold for an invariant Morse-Smale function.

Differential Geometry · Mathematics 2010-11-23 Hitoshi Yamanaka

The existence and construction of common invariant cones for families of real matrices is considered. The complete results are obtained for 2x2 matrices (with no additional restrictions) and for families of simultaneously diagonalizable…

Rings and Algebras · Mathematics 2009-03-04 Leiba Rodman , Hakan Seyalioglu , Ilya M. Spitkovsky

We review the Reidemeister torsion, Ray-Singer's analytic torsion and the Cheeger-M"uller theorem. We describe the analytic torsion of the de Rham complex twisted by a flux form introduced by the current authors and recall its properties.…

Differential Geometry · Mathematics 2010-03-13 Varghese Mathai , Siye Wu

We prove the Complete nontrivial cycle-intersection theorem for systems of permutations.

Combinatorics · Mathematics 2021-04-06 Vladimir Blinovsky , Llohann D. Sperança

In this paper we give a geometric characterization of the cones of toric varieties that are complete intersections. In particular, we prove that the class of complete intersection cones is the smallest class of cones which is closed under…

Algebraic Geometry · Mathematics 2007-05-23 Nickolas Michelacakis , Apostolos Thoma

In this note, we consider applications of Ratner's theorem to constructions of families of polynomials with dense values on the set of primitive integer points from the viewpoint of invariant theory.

Representation Theory · Mathematics 2007-05-23 Akihiko Yukie

We deal with the restriction phenomenon for the Fourier transform. We prove that each of the restriction conjectures for the sphere, the paraboloid, the elliptic hyperboloid in $\mathbb{R}^n$ implies that for the cone in $\mathbb{R}^{n+1}$.…

Classical Analysis and ODEs · Mathematics 2008-04-24 Fabio Nicola

The main result of this announcement is a formula for the tensor product of the class of a homogeneous line bundle with a Schubert class, expressed as a K(X)-linear combination of Schubert classes. We believe that this formula is the most…

Representation Theory · Mathematics 2007-05-23 Harsh Pittie , Arun Ram

A combinatorial criterion for the edge ring of a finite connected graph to satisfy Serre's condition R_1 is studied.

Combinatorics · Mathematics 2015-06-09 Takayuki Hibi , Lukas Katthän

We propose a geometric and categorical approach to the Hodge Conjecture for all smooth projective complex varieties. By embedding any such variety into a flat family with general fibers smooth complete intersections, we prove the conjecture…

Algebraic Geometry · Mathematics 2025-08-15 Karim Mansour

The set $\mathit{RT}(M)$ of values of the $\mathit{SL}(2,\mathbb{C})$-Reidemeister torsion of a 3-manifold $M$ can be both finite and infinite. We prove that $\mathit{RT}(M)$ is a finite set if $M$ is the splice of two certain knots in the…

Geometric Topology · Mathematics 2022-01-27 Teruaki Kitano , Yuta Nozaki

In this paper we study sectional curvature bounds for Riemannian manifolds with density from the perspective of a weighted torsion free connection introduced recently by the last two authors. We develop two new tools for studying weighted…

Differential Geometry · Mathematics 2017-07-19 Lee Kennard , William Wylie , Dmytro Yeroshkin

We prove several exact quantitative versions of Helly's and Tverberg's theorems, which guarantee that a finite family of convex sets in $R^d$ has a large intersection. Our results characterize conditions that are sufficient for the…

Combinatorics · Mathematics 2020-05-05 Sherry Sarkar , Alexander Xue , Pablo Soberón

For a manifold with an affine connection, we prove formulas which infinitesimally quantify the gap in a certain naturally defined open geodesic quadrilateral associated to a pair of tangent vectors $u$, $v$ at a point of the manifold. We…

Differential Geometry · Mathematics 2019-10-16 Nitin Nitsure

We construct the semi-infinite tensor structure on the semiderived category of quasi-coherent torsion sheaves on an ind-scheme endowed with a flat affine morphism into an ind-Noetherian ind-scheme with a dualizing complex. The semitensor…

Algebraic Geometry · Mathematics 2023-09-21 Leonid Positselski

We shall consider sections of an elliptic scheme $\mathcal{E}$ over a(n affine) base curve $B$, and study the points of $B$ where the section takes a torsion value. In particular, we shall relate the distribution in $B$ of these points with…

Algebraic Geometry · Mathematics 2019-12-06 Pietro Corvaja , Julian Demeio , David Masser , Umberto Zannier

We study effective versions of unlikely intersections of images of torsion points of elliptic curves on the projective line.

Algebraic Geometry · Mathematics 2017-06-07 Fedor Bogomolov , Hang Fu , Yuri Tschinkel

We give a general description of the moment cone associated with an arbitrary finite-dimensional unitary representation of a compact, connected Lie group in terms of finitely many linear inequalities. Our method is based on combining…

Quantum Physics · Physics 2017-12-20 Michèle Vergne , Michael Walter

Let X be a subscheme of a reduced scheme Y. Then Y has a flat "degeneration to the normal cone" C_X Y of X, and this degeneration plays a key step in Fulton and MacPherson's "basic construction" in intersection theory. The intersection…

Algebraic Geometry · Mathematics 2010-04-26 Allen Knutson

In our previous two papers, we constructed an $r$-spin theory in genus zero for Riemann surfaces with boundary and fully determined the corresponding intersection numbers, providing an analogue of Witten's $r$-spin conjecture in genus zero…

Mathematical Physics · Physics 2022-11-30 Alexandr Buryak , Emily Clader , Ran J. Tessler