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We give a functorial characterization of Mittag-Leffler modules and strict Mittag-Leffler modules.

Commutative Algebra · Mathematics 2017-07-12 Carlos Sancho , Fernando Sancho , Pedro Sancho

We construct relative abelian categories in the sense of MacLane for models of algebraic systems in (co)complete abelian categories. As an example, we consider an analogue of Hochschild-Mitchell cohomology for the functor of Yoneda…

K-Theory and Homology · Mathematics 2017-06-20 Simeon Pol'shin

We construct a correspondence between the cohomology groups of a group $G$ relative to a family of subgroups $\famS$ and the classes of `relative extensions' of $G$ by abelian groups, modulo a certain equivalence relation. We establish this…

Group Theory · Mathematics 2022-09-15 Gareth Wilkes

We generalize and clarify Gerstenhaber and Schack's "Special Cohomology Comparison Theorem". More specifically we obtain a fully faithful functor between the derived categories of bimodules over a prestack over a small category U and the…

K-Theory and Homology · Mathematics 2009-05-15 Wendy Lowen , Michel Van den Bergh

In this paper, we investigate how the initial models and the final models for the polynomial functors can be uniformly specified in matching logic.

Logic in Computer Science · Computer Science 2023-09-26 Dorel Lucanu

It is known that homology and inverse limit functors do not commute. In the paper we consider this very problem and find its application for various homology theories. In particular, on the category of general topological spaces, there are…

Algebraic Topology · Mathematics 2024-03-20 Anzor Beridze , Leonard Mdzinarishvili

This work introduces a general theory of universal pseudomorphisms and develops their connection to diagrammatic coherence. The main results give hypotheses under which pseudomorphism coherence is equivalent to the coherence theory of…

Category Theory · Mathematics 2025-07-02 Nick Gurski , Niles Johnson

The category of small covariant functors from simplicial sets to simplicial sets supports the projective model structure. In this paper we construct various localizations of the projective model structure and also give a variant for…

Algebraic Topology · Mathematics 2013-09-11 Georg Biedermann , Boris Chorny , Oliver Röndigs

We provide a thorough construction of a system of compatible determinant line bundles over spaces of Fredholm operators, fully verify that this system satisfies a number of important properties, and include explicit formulas for all…

Differential Geometry · Mathematics 2022-05-31 Aleksey Zinger

We elaborate on the interpretation of some mixed finite element spaces in terms of differential forms. First we develop a framework in which we show how tools from algebraic topology can be applied to the study of their cohomological…

Numerical Analysis · Mathematics 2011-06-20 Snorre Harald Christiansen

We review the polynomial structure of the topological string partition functions as solutions to the holomorphic anomaly equations. We also explain the connection between the ring of propagators defined from special K\"ahler geometry and…

High Energy Physics - Theory · Physics 2015-09-09 Jie Zhou

A covariant functor from the category of the complex tori to the category of the Effros-Shen algebras is constructed. The functor maps isomorphic complex tori to the stably isomorphic Effros-Shen algebras. Our construction is based on the…

Algebraic Geometry · Mathematics 2009-05-01 Igor Nikolaev

A family of systems related to a linear and bilinear evolution of roots of polynomials in the complex plane is considered. Restricted to the line, the evolution induces dynamics of the Coulomb charges in external potentials, while its fixed…

Mathematical Physics · Physics 2009-11-07 Igor Loutsenko

Applying the theory of Gr\"{o}bner basis to the Schubert presentation of the cohomology of Grassmannians, we extend the homology rigidity results known for the classical Grassmannians to the exceptional cases.

Algebraic Topology · Mathematics 2014-04-02 Fang Li , Haibao Duan

We describe the action of the different Frobenius morphisms on the cohomology ring of the moduli stack of algebraic vector bundles of fixed rank and determinant on an algebraic curve over a finite field in characteristic p and analyse…

Algebraic Geometry · Mathematics 2007-05-23 Frank Neumann , Ulrich Stuhler

We construct a functor valued invariant of oriented tangles on certain singular blocks of category O. Parabolic subcategories of these blocks categorify tensor products of various fundamental sl(k) representations. Projective functors…

Quantum Algebra · Mathematics 2007-05-23 Joshua Sussan

We extend the authors' previous work on Wiener-Wintner double recurrence theorem to the case of polynomials.

Dynamical Systems · Mathematics 2014-08-26 Idris Assani , Ryo Moore

Using quilted Floer cohomology and relative quilt invariants, we define a composition functor for categories of Lagrangian correspondences in monotone and exact symplectic Floer theory. We show that this functor agrees with geometric…

Symplectic Geometry · Mathematics 2015-03-13 Katrin Wehrheim , Chris T. Woodward

We study the cohomology of the Schwinger term arising in second quantization of the class of observables belonging to the restricted general linear algebra. We prove that, for all pseudodifferential operators in 3+1 dimensions of this type,…

High Energy Physics - Theory · Physics 2010-11-01 Martin Cederwall , Gabriele Ferretti , Bengt E. W. Nilsson , Anders Westerberg

The Stirling numbers of the first kind can be represented in terms of a new class of polynomials that are closely related to the Bernoulli polynomials. Recursion relations for these polynomials are given.

Mathematical Physics · Physics 2007-05-23 Carl M. Bender , Dorje C. Brody , Bernhard K. Meister