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We give a new differential proof of our result on the maximal rank of generic unions of points of multiplicity two in projective space in degrees greater than five. This simplifies somewhat our proof of the Waring conjecture.

alg-geom · Mathematics 2008-02-03 J. Alexander , A. Hirschowitz

In this paper we settle long-standing questions regarding the combinatorial complexity of Minkowski sums of polytopes: We give a tight upper bound for the number of faces of a Minkowski sum, including a characterization of the case of…

Combinatorics · Mathematics 2021-01-19 Karim Adiprasito , Raman Sanyal

In this expository note, we review the standard formulation of mirror symmetry for Calabi-Yau hypersurfaces in toric varieties, and compare this construction to a description of mirror symmetry for K3 surfaces which relies on a sublattice…

Algebraic Geometry · Mathematics 2017-02-21 Ursula Whitcher

Given an algebra with an idempotent, we introduce two procedures to construct families of new algebras, termed mirror-reflective algebras and reduced mirror-reflective algebras. We then establish connections among these algebras by…

Representation Theory · Mathematics 2022-11-17 Hongxing Chen , Ming Fang , Changchang Xi

We give a new proof of a theorem of Montejano and Karasev regarding $k$-dimensional transversals to small families of convex sets. While their proof uses technical algebraic and topological tools, our proof is a simple application of the…

Combinatorics · Mathematics 2024-09-06 Andreas F. Holmsen

In this note, we give a simple proof of the Todorov's surjectivity result on the period map of K3 surfaces in a differential geometric setting. Our proof makes use of collasping geometry of hyperk\"{a}hler 4-manifolds developped by…

Differential Geometry · Mathematics 2023-04-20 Hongyi Liu

We prove that generic Hitchin representations are strongly dense: every pair of non commuting elements in their image generate a Zariski-dense subgroup of SL_n(R). The proof uses a theorem of Rapinchuk, Benyash-Krivetz and Chernousov, to…

Group Theory · Mathematics 2022-02-21 D. D. Long , A. W. Reid , M. Wolff

We apply the better-behaved GKZ hypergeometric systems to study toric Calabi-Yau Deligne-Mumford stacks and their Hori-Vafa mirrors given by affine hypersurfaces in algebraic tori. We show that the integral structures of A-branes and…

Algebraic Geometry · Mathematics 2025-08-29 Zengrui Han

In this article, we will study prime spectrum of Krasner hyperrings and Zariski topology on them, which play an important role in algebraic geometry. Then some results about the relationship between the topological properties of Spec(R) and…

General Mathematics · Mathematics 2025-02-25 Reza Ameri , Behnam Afshar

We review some classical and modern aspects of hypergeometric differential equations, including $A$-hypergeometric systems of Gel'fand, Graev, Kapranov and Zelevinsky. Some recent advances in this theory, such as Euler-Koszul homology, rank…

Algebraic Geometry · Mathematics 2025-05-20 Thomas Reichelt , Mathias Schulze , Christian Sevenheck , Uli Walther

Ardila and Brugall\'e conjectured that double tropical Welschinger invariants of Hirzebruch surfaces are piecewise quasipolynomial. In this work, we prove the conjecture holds in full generality, i.e. for toric surfaces corresponding to…

Algebraic Geometry · Mathematics 2026-05-15 Vincenzo Reda

We derive the combinatorial representations of Picard group and deformation space of anti-canonical hypersurfaces of a toric variety using techniques in toric geometry. The mirror cohomology correspondence in the context of mirror symmetry…

Algebraic Geometry · Mathematics 2011-06-14 Shi-shyr Roan

Thurston's Ending Lamination Conjecture states that a hyperbolic 3-manifold N with finitely generated fundamental group is uniquely determined by its topological type and its end invariants. In this paper we prove this conjecture for…

Geometric Topology · Mathematics 2011-03-10 Jeffrey F. Brock , Richard D. Canary , Yair N. Minsky

The most impressively prolific exploration of superstring models (aiming for our physical reality) has been focused on worldsheet-supersymmetric gauged linear sigma models and the closely associated complex-algebraic toric geometry. Mirror…

High Energy Physics - Theory · Physics 2026-05-11 Tristan Hübsch

In previous work, the second author introduced a topology, for spaces of irreducible representations, that reduces to the classical Zariski topology over commutative rings but provides a proper refinement in various noncommutative settings.…

Rings and Algebras · Mathematics 2007-05-23 K. R. Goodearl , E. S. Letzter

In this article, we consider the phenomenon of complete coincidence of the key properties of pairs of Calabi-Yau manifolds realized as hypersurfaces in two different weighted projective spaces. More precisely, the first manifold in such a…

High Energy Physics - Theory · Physics 2020-05-14 Mikhail Belakovskiy , Alexander Belavin

We survey the recent results and current issues on the topological rigidity problem for closed aspherical manifolds, i.e., connected closed manifolds whose universal coverings are contractible. A number of open problems and conjectures are…

Geometric Topology · Mathematics 2017-08-22 Ramesh Kasilingam

In 2021, Dzhunusov and Zaitseva classified two-dimensional normal affine commutative algebraic monoids. In this work, we extend this classification to noncommutative monoid structures on normal affine surfaces. We prove that two-dimensional…

Algebraic Geometry · Mathematics 2021-07-16 Boris Bilich

Using the Tannakian formalism, we formulate conjectural analogs of Chebotar\"ev's Density Theorem for $F$-isocrystals over a smooth geometrically irreducible variety defined over a finite field. We prove these analogs for several large…

Number Theory · Mathematics 2025-11-21 Urs Hartl , Ambrus Pal

For $n \ge 2$, we prove that a finite volume complex hyperbolic $n$-manifold containing infinitely many maximal properly immersed totally geodesic submanifolds of dimension at least two is arithmetic, paralleling our previous work for real…

Dynamical Systems · Mathematics 2023-02-23 Uri Bader , David Fisher , Nicholas Miller , Matthew Stover