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We show that stable derivators, like stable model categories, admit Mayer-Vietoris sequences arising from cocartesian squares. Along the way we characterize homotopy exact squares, and give a detection result for colimiting diagrams in…

Category Theory · Mathematics 2013-12-20 Moritz Groth , Kate Ponto , Michael Shulman

We study spectra of noncommutative dynamical systems, representations of fractal groups, and regular graphs. We explicitly compute these spectra for five examples of groups acting on rooted trees, and in three cases obtain totally…

Group Theory · Mathematics 2009-11-28 Laurent Bartholdi , Rostislav I. Grigorchuk

We describe an algorithm to compute the stable multiplicity of a family of irreducible representations in the cohomology of ordered configuration space of the plane. Using this algorithm, we compute the stable multiplicities of all families…

Algebraic Geometry · Mathematics 2025-09-19 Emil Geisler

The James fibrations give rise to the geometric EHP sequences of homotopy groups of spheres. Using techniques from the Lambda algebra, \cite{BCKQRS66} shows that there are similar long exact sequences of Ext groups defining the $E_{2}-$page…

Algebraic Topology · Mathematics 2016-01-01 The Cuong Nguyen

We present a descent style, Bockstein spectral sequence computing Ext over the motivic Steenrod algebra over $\R$ and related sub-Hopf algebras. We demonstrate the workings of this spectral sequence in several examples, providing motivic…

Algebraic Topology · Mathematics 2009-04-15 Michael A Hill

We argue that the very effective cover of hermitian $K$-theory in the sense of motivic homotopy theory is a convenient algebro-geometric generalization of the connective real topological $K$-theory spectrum. This means the very effective…

K-Theory and Homology · Mathematics 2017-12-06 Alexey Ananyevskiy , Oliver Röndigs , Paul Arne Østvær

This paper is a continuation of the version I of the same title, which intends to clarify and expand the results in the last chapter of `the green book' by the second author. In particular, we give the stable homotopy groups of $p$-local…

Algebraic Topology · Mathematics 2018-06-29 Hirofumi Nakai , Douglas C. Ravenel

We construct smooth presentations of algebraic stacks that are local epimorphisms in the Morel-Voevodsky $\mathbb{A}^1$-homotopy category. As a consequence we show that the motive of a smooth stack (in Voevodsky's triangulated category of…

Algebraic Geometry · Mathematics 2025-01-28 Neeraj Deshmukh , Jack Hall

A stable model category is a setting for homotopy theory where the suspension functor is invertible. The prototypical examples are the category of spectra in the sense of stable homotopy theory and the category of unbounded chain complexes…

Algebraic Topology · Mathematics 2017-12-04 Stefan Schwede , Brooke Shipley

We compute the 3-primary v1-periodic homotopy groups of the exceptional Lie group E7. Now E8 at the primes 3 and 5 is the only compact simple Lie group whose odd-primary v1-periodic homotopy groups remian to be computed. The main work is…

Algebraic Topology · Mathematics 2007-05-23 Donald M. Davis

We construct and study a motivic lift of a spectral sequence associated to a stratified scheme, recently discovered by Petersen in the context of mixed Hodge theory and $\ell$-adic Galois representations. The original spectral sequence…

Algebraic Geometry · Mathematics 2024-08-27 Clément Dupont , Daniel Juteau

We find computable criteria for stability of symplectic leaves of Poisson manifolds. Using Poisson geometry as an inspiration, we also give a general criterion for stability of leaves of Lie algebroids, including singular ones. This not…

Differential Geometry · Mathematics 2010-01-18 Marius Crainic , Rui Loja Fernandes

In Hamiltonian systems subjected to periodic perturbations the stable and unstable manifolds of the unstable periodic orbits provide the dynamical "skeleton" that drives the mixing process and bounds the chaotic regions of the phase space.…

Plasma Physics · Physics 2016-10-05 David Ciro Taborda , Todd Edwin Evans , Iberê Luiz Caldas

We revisit methods of proof of the Adams Conjecture in order to correct and supplement earlier efforts to prove analogous conjectures in the stable homotopy category. We utilize simplicial schemes over an algebraically closed field of…

Algebraic Topology · Mathematics 2026-01-16 Eric M. Friedlander

The subject of this paper is the design of efficient and stable spectral methods for time-dependent partial differential equations in unit balls. We commence by sketching the desired features of a spectral method, which is defined by a…

Numerical Analysis · Mathematics 2023-12-21 Jing Gao , Arieh Iserles

In this note, we outline the general development of a theory of symmetric homology of algebras, an analog of cyclic homology where the cyclic groups are replaced by symmetric groups. This theory is developed using the framework of crossed…

Algebraic Topology · Mathematics 2007-11-05 Shaun Ault , Zbigniew Fiedorowicz

This paper introduces the trivial fiber topology on schemes. For one-dimensional base schemes, we use it to describe fibrant replacements in the stable motivic homotopy category and motivic infinite loop spaces. We also extend the…

Algebraic Geometry · Mathematics 2023-01-16 A. Druzhinin , Håkon Kolderup , Paul Arne Østvær

We discuss the structure of integral etale motivic cohomology groups of smooth and projective schemes over algebraically closed fields, finite fields, local fields, and arithmetic schemes.

Algebraic Geometry · Mathematics 2016-09-09 Thomas H. Geisser

This is an expository paper providing an overview of the unstable motivic homotopy category using the theory of $(\infty,1)$-categories. In this paper, we examine two constructions in the literature and discuss their equivalence.

Algebraic Topology · Mathematics 2018-10-02 Thomas Brazelton

We develop several aspects of local and global stability in continuous first order logic. In particular, we study type-definable groups and genericity.

Logic · Mathematics 2014-02-10 Itaï Ben Yaacov
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