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Following the approach of Gromov and Witten, we define invariants under deformation of stongly semipositive real symplectic six-manifolds. These invariants provide lower bounds in real enumerative geometry, namely for the number of real…

Algebraic Geometry · Mathematics 2007-09-17 Jean-Yves Welschinger

Any non-degenerate quadratic form over a Hilbertian field (e.g., a number field) is isomorphic to a scaled trace form. In this work we extend this result to more general fields. In particular, prosolvable and prime-to-p extensions of a…

Number Theory · Mathematics 2007-08-29 Lior Bary-Soroker , Dubi Kelmer

We consider $2$-designs which admit a group of automorphisms that is flag-transitive and leaves invariant a chain of nontrivial point-partitions. We build on our recent work on $2$-designs which are block-transitive but not necessarily…

Combinatorics · Mathematics 2024-01-26 Carmen Amarra , Alice Devillers , Cheryl E. Praeger

DEKL 2.0 is a dependent type-theoretic framework for trace-indexed knowledge evolution. Its central claim is that the proof calculus remains monotone under standard structural rules, while non-monotonic behavior arises semantically from…

Logic in Computer Science · Computer Science 2026-04-27 Chen Peng

We propose an axiomatic approach towards studying unlikely intersections by introducing the framework of distinguished categories. This includes commutative algebraic groups and mixed Shimura varieties. It allows us to define all basic…

Number Theory · Mathematics 2024-11-26 Fabrizio Barroero , Gabriel Andreas Dill

An interval coloring of a graph G is a proper coloring of E(G) by positive integers such that the colors on the edges incident to any vertex are consecutive. A (3,4)-biregular bigraph is a bipartite graph in which each vertex of one part…

Combinatorics · Mathematics 2007-05-23 Armen S. Asratian , Carl Johan Casselgren , Jennifer Vandenbussche , Douglas B. West

When two streams of pedestrians cross at an angle, striped patterns spontaneously emerge as a result of local pedestrian interactions. This clear case of self-organized pattern formation remains to be elucidated. In counterflows, with a…

We use Gay and Kirby's description of 4-manifolds in terms of trisections and trisection diagrams to define a new 4-manifold invariant. The algebraic data are an indecomposable finite semisimple bimodule category over a pair of spherical…

Quantum Algebra · Mathematics 2025-11-25 Catherine Meusburger , Vincentas Mulevicius , Fiona Torzewska

Involutive category theory provides a flexible framework to describe involutive structures on algebraic objects, such as anti-linear involutions on complex vector spaces. Motivated by the prominent role of involutions in quantum (field)…

Category Theory · Mathematics 2019-02-13 Marco Benini , Alexander Schenkel , Lukas Woike

We identify Melrose's suspended algebra of pseudodifferential operators with a subalgebra of the algebra of parametric pseudodifferential operators with parameter space $\R$. For a general algebra of parametric pseudodifferential operators,…

Functional Analysis · Mathematics 2007-05-23 Matthias Lesch , Markus J. Pflaum

The Lefschetz number and fixed point index can be thought of as two different descriptions of the same invariant. The Lefschetz number is algebraic and defined using homology. The index is defined more directly from the topology and is a…

Algebraic Topology · Mathematics 2015-04-27 Kate Ponto

We consider the multigraded Hilbert scheme corresponding to the Hilbert function of a finite number of points in general position in a smooth projective complex toric variety. We develop several criteria for a point of that parameter space…

Algebraic Geometry · Mathematics 2023-06-16 Tomasz Mańdziuk

It is shown that Hattori-Stallings trace induces a homomorphism of abelian groups, called Hattori-Stallings character, from the $K_1$-group of endomorphisms of the perfect derived category of an algebra to its zero-th Hochschild homology,…

K-Theory and Homology · Mathematics 2013-03-01 Yang Han

Traced monoidal categories are used to model processes that can feed their outputs back to their own inputs, abstracting iteration. The category of finite dimensional Hilbert spaces with the direct sum tensor is not traced. But…

Category Theory · Mathematics 2026-02-18 Aaron David Fairbanks , Peter Selinger

Let X* be a subset of an affine space A^s, over a finite field K, which is parameterized by the edges of a clutter. Let X and Y be the images of X* under the maps x --> [x] and x --> [(x,1)] respectively, where [x] and [(x,1)] are points in…

Commutative Algebra · Mathematics 2013-06-24 Maria Vaz Pinto , Rafael H. Villarreal

This chapter of the forthcoming Handbook of Graphical Models contains an overview of basic theorems and techniques from algebraic geometry and how they can be applied to the study of conditional independence and graphical models. It also…

Statistics Theory · Mathematics 2017-05-23 Thomas Kahle , Johannes Rauh , Seth Sullivant

This article introduces patterns of ideals of numerical semigroups, thereby unifying previous definitions of patterns of numerical semigroups. Several results of general interest are proved. More precisely, this article presents results on…

Rings and Algebras · Mathematics 2015-01-30 Klara Stokes

In this paper, we introduce and study two new classes of commutative rings, namely semi transitional rings and transitional rings, which extend several classical ideas arising from rings of continuous functions and their variants. A general…

Commutative Algebra · Mathematics 2025-11-21 Sourav Koner , Titas Saha , Biswajit Mitra

This work explores the spectra of quantum graphs where the Schr\"odinger operator on the edges is equipped with a potential. The scattering approach, which was originally introduced for the potential free case, is extended to this case and…

Mathematical Physics · Physics 2015-06-11 Ralf Rueckriemen , Uzy Smilansky

We give a procedure that can be used to automatically satisfy invariants of a certain shape. These invariants may be written with the operations intersection, composition and converse over binary relations, and equality over these…

Logic in Computer Science · Computer Science 2018-06-26 Sebastiaan J. C. Joosten