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We use motivic colimits to construct power operations on the homotopy groups of normed motivic spectra admitting a (normed) map from HF_2. We establish enough of their standard properties to prove that the motivic dual Steenrod algebra is…

K-Theory and Homology · Mathematics 2022-10-14 Tom Bachmann , Elden Elmanto , Jeremiah Heller

In this expository article, we give the foundations, basic facts, and first examples of unstable motivic homotopy theory with a view towards the approach of Asok-Fasel to the classification of vector bundles on smooth complex affine…

Algebraic Geometry · Mathematics 2016-11-08 Benjamin Antieau , Elden Elmanto

We show that variants of the classical reflection functors from quiver representation theory exist in any abstract stable homotopy theory, making them available for example over arbitrary ground rings, for quasi-coherent modules on schemes,…

Algebraic Topology · Mathematics 2016-02-03 Moritz Groth , Jan Šťovíček

We introduce a notion of $\Theta$-categories, which is a refinement of the notion of symmetric monoidal $\infty$-categories. We use this notion to prove a Tannakian duality statement, relating $\Theta$-categories with fpqc-stacks by means…

Algebraic Geometry · Mathematics 2025-08-06 Joost Nuiten , Bertrand Toen

An elementary notion of homotopy can be introduced between arrows in a cartesian closed category $E$. The input is a finite-product-preserving endofunctor $\Pi_0$ with a natural transformation $p$ from the identity which is surjective on…

Category Theory · Mathematics 2024-05-08 Enrique Ruiz Hernández , Pedro Solórzano

We show that mapping spaces in the p-local motivic stable category over an Fp-scheme are strictly commutative monoids (whence HZ-modules) in a canonical way.

K-Theory and Homology · Mathematics 2022-09-13 Tom Bachmann

Let $k$ be a perfect field of characteristic $p$ and $W(k)$ its ring of Witt vectors. We construct an equivalence of categories between the full subcategory of the derived category of quasi-coherent sheaves on the syntomification of $W(k)$…

Number Theory · Mathematics 2025-07-08 Gleb Terentiuk , Vadim Vologodsky , Yujie Xu

Let $\V$ be a symmetric monoidal model category and let $X$ be an object in $\V$. From this we can construct a new symmetric monoidal model category $Sp^{\Sigma}(\V,X)$ of symmetric spectra objects in $\V$ with respect to $X$, together with…

Algebraic Geometry · Mathematics 2013-06-18 Marco Robalo

We make some computations in stable motivic homotopy theory over Spec \mathbb{C}, completed at 2. Using homotopy fixed points and the algebraic K-theory spectrum, we construct a motivic analogue of the real K-theory spectrum KO. We also…

Algebraic Topology · Mathematics 2010-02-12 Daniel C. Isaksen , Armira Shkembi

We define the cohomological Hall algebra ${AHA}_{Higgs(X)}$ of the ($2$-dimensional) Calabi-Yau category of Higgs sheaves on a smooth projective curve $X$, as well as its nilpotent and semistable variants, in the context of an arbitrary…

Algebraic Geometry · Mathematics 2020-04-22 Francesco Sala , Olivier Schiffmann

We establish a foundational homotopical framework for ternary $\Gamma$-modules by establishing that $\mathcal{T}\text{-Mod}$ is a Barr-exact, monoidal closed category. We resolve the long-standing "additivity obstruction" in non-binary…

Rings and Algebras · Mathematics 2026-01-15 Chandrasekhar Gokavarapu

We construct a motivic spectral sequence for the relative homotopy invariant K-theory of a closed immersion of schemes $D \subset X$. The $E_2$-terms of this spectral sequence are the cdh-hypercohomology of a complex of equi-dimensional…

Algebraic Geometry · Mathematics 2019-03-13 Amalendu Krishna , Pablo Pelaez

Let k be a field, let G be a finite group and let T be a split k-torus on which G acts multiplicatively, and for every m greater than 1 denote by T[m] the m-torsion subgroup of T. Under a suitable assumption on m, we show that the motivic…

Algebraic Geometry · Mathematics 2019-10-31 Ivan Martino , Federico Scavia

Motivated by calculations of motivic homotopy groups, we give widely attained conditions under which operadic algebras and modules thereof are preserved under (co)localization functors

Algebraic Topology · Mathematics 2018-12-06 Javier J. Gutiérrez , Oliver Röndigs , Markus Spitzweck , Paul Arne Østvær

This paper introduces a new cohomology theory for schemes of finite type over an arithmetic ring. The main motivation for this Arakelov-theoretic version of motivic cohomology is the conjecture on special values of $L$-functions and zeta…

Number Theory · Mathematics 2015-05-11 Andreas Holmstrom , Jakob Scholbach

We present a geometric construction of push-forward maps along projective morphisms for cohomology theories representable in the stable motivic homotopy category assuming that the element corresponding to the stable Hopf map is inverted in…

Algebraic Geometry · Mathematics 2015-10-26 Alexey Ananyevskiy

We describe the category of regular holonomic modules over the ring D[[h]] of linear differential operators with a formal parameter h. In particular, we establish the Riemann-Hilbert correspondence and discuss the additional t-structure…

Algebraic Geometry · Mathematics 2011-08-09 Andrea D'Agnolo , Stephane Guillermou , Pierre Schapira

We give in this paper an isomorphism theorem between derived functors over categories of modules.There is a nice class of categories that gives examples in which this theorem applies for a special construction. This leads us to a new…

Algebraic Topology · Mathematics 2007-05-23 Mathieu Zimmermann

For (X,L) a polarized toric variety and G a torus of automorphisms of (X,L), denote by Y the GIT quotient X/G. We define a family of fully faithful functors from the category of torus equivariant reflexive sheaves on Y to the category of…

Algebraic Geometry · Mathematics 2021-12-15 Andrew Clarke , Carl Tipler

In this paper, we construct incomplete versions of the equivariant stable category; i.e., equivariant stabilization of the category of $G$-spaces with respect to incomplete systems of transfers encoded by an $N_\infty$ operad $\mathcal{O}$.…

Algebraic Topology · Mathematics 2021-02-17 Andrew J. Blumberg , Michael A. Hill
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