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Related papers: A remark on configuration spaces of two points

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For most aspherical Seifert-fibered 3-manifolds $M$, the space of Seifert fiberings $SF(M)$ is known to have contractible components. It is also known that the space of Hopf fiberings of the three-sphere is noncontractible. We provide the…

Geometric Topology · Mathematics 2024-04-15 Yi Wang , Jingye Yang

Quantum Chern-Simons invariants of differentiable manifolds are analyzed from the point of view of homological algebra. Given a manifold M and a Lie (or, more generally, an L-infinity) algebra g, the vector space H^*(M) \otimes g has the…

Quantum Algebra · Mathematics 2015-06-18 Christopher Braun , Andrey Lazarev

We show that pairs $(X,Y)$ of 1-spherical objects in $A_\infty$-categories, such that the morphism space ${\rm Hom}(X,Y)$ is concentrated in degree 0, can be described by certain noncommutative orders over (possibly stacky) curves. In fact,…

Algebraic Geometry · Mathematics 2019-10-02 Alexander Polishchuk

We show that the canonical map from the associative operad to the unital associative operad is a homotopy epimorphism for a wide class of symmetric monoidal model categories. As a consequence, the space of unital associative algebra…

Algebraic Topology · Mathematics 2016-01-27 Fernando Muro

This paper presents two algorithms. In their simplest form, the first algorithm decides the existence of a pointed homotopy between given simplicial maps f, g from X to Y and the second computes the group $[\Sigma X,Y]^*$ of pointed…

Algebraic Topology · Mathematics 2013-12-10 Marek Filakovský , Lukáš Vokřínek

We give a positive answer to the Chavel's conjecture [J. Diff. Geom. 4 (1970), 13-20]: a simply connected rank one normal homogeneous space is symmetric if any pair of conjugate points are isotropic. It implies that all simply connected…

Differential Geometry · Mathematics 2012-03-22 J. C. González-Dávila , A. M. Naveira

The geometric Hopf invariant of a stable map F is a stable Z_2-equivariant map h(F) such that the stable Z_2-equivariant homotopy class of h(F) is the primary obstruction to F being homotopic to an unstable map. In this paper we express the…

Algebraic Topology · Mathematics 2010-05-18 Michael Crabb , Andrew Ranicki

We prove a persistence result for noncompact normally hyperbolic invariant manifolds in Riemannian manifolds of bounded geometry. The bounded geometry of the ambient manifold is a crucial assumption in order to control the uniformity of all…

Dynamical Systems · Mathematics 2012-08-07 Jaap Eldering

We studied the axiom of anti-invariant 2-spheres and the axiom of co-holomorphic $(2n+1)$-spheres. We proved that a nearly K\"{a}hlerian manifold satisfying the axiom of anti-invariant 2-spheres is a space of constant holomorphic sectional…

Differential Geometry · Mathematics 2014-05-27 Hakan Mete Taştan

This work is a comparative study between the existence of fixed point for homomorphisms in a class of binary relationnal systems and the existence of fixed point for nonexpansive mappings in semimetric spaces.

General Topology · Mathematics 2022-08-24 A. El Adraoui , M. Kabil , A. Kamous , S. Lazaiz

Given a space X, we study the homotopy type of ${\mathcal B}_n(X)$ the space obtained as "the union of all (n-1)-simplexes spanned by points in X". This is a space encountered in non-linear analysis under the name of "space of barycenters"…

Algebraic Topology · Mathematics 2010-06-11 Sadok Kallel , Rym Karoui

We discuss the existence of equilibrium configurations for the Hamiltonian point-vortex model on a closed surface $\Sigma$. The topological properties of $\Sigma$ determine the occurrence of three distinct situations, corresponding to…

Analysis of PDEs · Mathematics 2015-02-20 Teresa D'Aprile , Pierpaolo Esposito

We compute the homology of the space of equivariant loops on the classifying space of a simplicial monoid $M$ with anti-involution, provided $\pi_0 (M)$ is central in the homology ring of $M$. The proof is similar to McDuff and Segal's…

K-Theory and Homology · Mathematics 2020-11-11 Kristian Jonsson Moi

We show that a homotopy equivalence between two non-compact orientable surfaces is homotopic to a homeomorphism if and only if it preserves the Goldman bracket, provided our surfaces are neither the plane nor the punctured plane.

Geometric Topology · Mathematics 2025-10-15 Sumanta Das , Siddhartha Gadgil , Ajay Kumar Nair

We prove the validity over $\mathbb{R}$ of a commutative differential graded algebra model of configuration spaces for simply connected closed smooth manifolds, answering a conjecture of Lambrechts--Stanley. We get as a result that the real…

Algebraic Topology · Mathematics 2019-04-05 Najib Idrissi

We analyze the question of which motivic homotopy types admit smooth schemes as representatives. We show that given a pointed smooth affine scheme $X$ and an embedding into affine space, the affine deformation space of the embedding gives a…

Algebraic Geometry · Mathematics 2022-09-13 Aravind Asok , Adrien Dubouloz , Paul Arne Østvær

We show that there exists a unique possible definition, with certain natural properties, of the multiple point space of a holomorphic map between complex manifolds. Our construction coincides with the double point space and the k-th…

Algebraic Geometry · Mathematics 2016-10-04 J. J. Nuño-Ballesteros , G. Peñafort-Sanchis

The observer moduli space of Riemannian metrics is the quotient of the space $\mathcal{R}(M)$ of all Riemannian metrics on a manifold $M$ by the group of diffeomorphisms $\mathrm{Diff}_{x_0}(M)$ which fix both a basepoint $x_0$ and the…

Differential Geometry · Mathematics 2019-12-11 Boris Botvinnik , Mark G. Walsh , David J. Wraith

We give a homotopy classification of the global defects in ordered media, and explain it via the example of biaxial nematic liquid crystals, i.e., systems where the order parameter space is the quotient of the $3$-sphere $S^3$ by the…

Soft Condensed Matter · Physics 2025-12-02 Yuta Nozaki , Tamás Kálmán , Masakazu Teragaito , Yuya Koda

Given Poincare spaces M and X, we study the possibility of compressing embeddings of M x I in X x I down to embeddings of M in X. This results in a new approach to embedding in the metastable range both in the smooth and Poincare duality…

Algebraic Topology · Mathematics 2014-10-01 John R. Klein