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We prove a geometrical version of Herbert's theorem by considering the self-intersection immersions of a self-transverse immersion up to bordism. This generalises Herbert's theorem to additional cohomology theories and gives a commutative…

Algebraic Topology · Mathematics 2014-10-01 Peter J. Eccles , Mark Grant

We investigate several categories related to transition structures, using a mixture of algebraic and topological methods. We show how two such categories are connected by a contravariant adjunction. This is the most detailed of a family of…

Category Theory · Mathematics 2026-04-16 Matthew Collinson

We show a method in constructing algebraic cycles via intersection theory. It leads to a proof of the Lefschetz standard conjecture.

Algebraic Geometry · Mathematics 2021-02-16 B. Wang

Within its traditional range of perversity parameters, intersection cohomology is a topological invariant of pseudomanifolds. This is no longer true once one allows superperversities, in which case intersection cohomology may depend on the…

Geometric Topology · Mathematics 2011-03-31 Greg Friedman

This paper constructs (with challenging obstacles) on the three torus with its cubical decomposition: Firstly, a combinatorial graded intersection algebra (graded by the codimension) which is commutative and associative defined by…

Geometric Topology · Mathematics 2025-02-11 Daniel An , Ruth Lawrence , Dennis Sullivan

We study intersection theory for differential algebraic varieties. Particularly, we study families of differential hypersurface sections of arbitrary affine differential algebraic varieties over a differential field. We prove the…

Logic · Mathematics 2015-02-25 James Freitag

We define and study the notion of numerical equivalence on algebraic cobordism cycles. We prove that algebraic cobordism modulo numerical equivalence is a finitely generated module over the Lazard ring, and it reproduces the Chow group…

Algebraic Geometry · Mathematics 2015-07-02 Anandam Banerjee , Jinhyun Park

For a quasi-projective scheme M which carries a perfect obstruction theory, we construct the virtual cobordism class of M. If M is projective, we prove that the corresponding Chern numbers of the virtual cobordism class are given by…

Algebraic Geometry · Mathematics 2017-05-17 Junliang Shen

We deform monomial space curves in order to construct examples of set-theoretical complete intersection space curve singularities. As a by-product we describe an inverse to Herzog's construction of minimal generators of non-complete…

Algebraic Geometry · Mathematics 2019-01-01 Michel Granger , Mathias Schulze

We introduce an equivalence relation, called cobordism, for words and study cobordism invariants of words inspired by methods of low-dimensional topology.

Combinatorics · Mathematics 2008-06-09 Vladimir Turaev

We prove cobordism index invariance for pseudo-differential elliptic operators on closed orbifolds with $K$--theoretical methods.

K-Theory and Homology · Mathematics 2008-07-11 Carla Farsi

Recently, there are many developments on the second main theorem for holomorphic curves into algebraic varieties intersecting divisors in general position or subgeneral position. In this paper, we refine the concept of subgeneral position…

Complex Variables · Mathematics 2018-02-26 Qingchun Ji , Qiming Yan , Guangsheng Yu

This paper studies algebraic residual intersections in rings with Serre's condition \( S_{s} \). It demonstrates that residual intersections admit free approaches i.e. perfect subideal with the same radical. This fact leads to determining a…

Commutative Algebra · Mathematics 2025-02-13 S. Hamid Hassanzadeh

We study the cobordism of manifolds with boundary, and its applications to codimension 2 embeddings $M^m\subset N^{m+2}$, using the method of the algebraic theory of surgery. The first main result is a splitting theorem for cobordisms of…

Geometric Topology · Mathematics 2018-05-22 Maciej Borodzik , András Némethi , Andrew Ranicki

In this paper we will prove that there exists a covariant functor from the category of schemes to the category of graphs. This functor provides a combination between algebraic varieties and combinatorial graphs so that the invariants…

Algebraic Geometry · Mathematics 2009-07-06 Feng-Wen An

We extend the hierarchy functors of [33] to the case of strong symplectic cobordisms, via deformations with Maurer--Cartan elements. In particular, we prove that the concave boundary of a strong cobordism has finite algebraic planar torsion…

Symplectic Geometry · Mathematics 2025-12-24 Agustin Moreno , Zhengyi Zhou

We determine the product structure on Hochschild cohomology of commutative algebras in low degrees, obtaining the answer in all degrees for complete intersection algebras. As applications, we consider cyclic extension algebras as well as…

Commutative Algebra · Mathematics 2014-01-13 Ragnar-Olaf Buchweitz , Collin Roberts

We give an alternative proof, valid in all characteristics, of a result of Lascar characterising the bounded automorphisms of an algebraically closed field. We generalise this method to various fields equipped with operators.

Logic · Mathematics 2017-12-06 Thomas Blossier , Charlotte Hardouin , Amador Martin-Pizarro

We prove an existence result for exact lagrangian cobordisms between closed legendrians.

Differential Geometry · Mathematics 2016-02-23 Sauvik Mukherjee

We calculate the genus zero cobordism-valued Gromov-Witten invariants of a point by refining the string equation on $\overline{\mathcal{M}}_{0,n}$ from the Chow ring to algebraic cobordism. This gives inductive formulas for cobordism-valued…

Algebraic Geometry · Mathematics 2026-03-05 Benjamin Ellis-Bloor