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We extend the stable motivic homotopy category of Voevodsky to the class of scalloped algebraic stacks, and show that it admits the formalism of Grothendieck's six operations. Objects in this category represent generalized cohomology…

代数几何 · 数学 2024-10-10 Adeel A. Khan , Charanya Ravi

A natural higher K-theoretic analogue of the triviality of vector bundles on affine toric varieties is the conjecture on nilpotence of the multiplicative action of the natural numbers on the K-theory of these varieties. This includes both…

K理论与同调 · 数学 2007-05-23 Joseph Gubeladze

Motivated by the Freed-Hopkins-Teleman theorem we study graded equivariant higher twists of $K$-theory for the groups $G = SU(n)$ induced by exponential functors. We compute the rationalisation of these groups for all $n$ and all…

K理论与同调 · 数学 2026-01-08 David E. Evans , Ulrich Pennig

To any rigid analytic space (in the sense of Fujiwara-Kato) we assign an $\mathbb{A}^1$-invariant rigid analytic homotopy category with coefficients in any presentable category. We show some functorial properties of this assignment as a…

代数拓扑 · 数学 2025-03-17 Christian Dahlhausen , Can Yaylali

The (A)CGW categories of Campbell and Zakharevich show how finite sets and varieties behave like the objects of an exact category for the purpose of algebraic $K$-theory. These structures admit a well-behaved Q-construction akin to…

K理论与同调 · 数学 2025-04-29 Maru Sarazola , Brandon T. Shapiro

We show that the map from $K({\mathbb S})$ to its chromatic completion is a connective cover and identify the fiber in $K$-theoretic terms. We combine this with recent work of Land-Mathew-Meier-Tamme to prove a form of "Waldhausen's…

K理论与同调 · 数学 2026-01-09 Andrew J. Blumberg , Michael A. Mandell , Allen Yuan

We prove that for the action of a finite constant group scheme, equivariant algebraic $K$-theory is represented by a colimit of Grassmannians in the equivariant motivic homotopy category. Using this result we show that the set of…

代数几何 · 数学 2025-08-15 K. Arun Kumar , Girja S Tripathi

We establish axiomatic characterizations of $K$-theory and $KK$-theory for real C*-algebras. In particular, let $F$ be an abelian group-valued functor on separable real C*-algebras. We prove that if $F$ is homotopy invariant, stable, and…

算子代数 · 数学 2012-10-15 Jeffrey L. Boersema , Efren Ruiz

The additivity theorem for derivateurs associated to complicial biWaldhausen categories is proved. Also, to any exact category in the sense of Quillen a K-theory space is associated. This K-theory is shown to satisfy the additivity,…

K理论与同调 · 数学 2007-05-23 Grigory Garkusha

The \begin{it} Invariance Theorem \end{it} of M. Gerstenhaber and S. D. Schack states that if $\mathbb{A}$ is a diagram of algebras then the subdivision functor induces a natural isomorphism between the Yoneda cohomologies of the category…

范畴论 · 数学 2010-08-12 Alin Stancu

We prove a conjecture of Rognes by establishing a localization cofiber sequence of spectra, K(Z) to K(ku) to K(KU) to Sigma K(Z), for the algebraic K-theory of topological K-theory. We deduce the existence of this sequence as a consequence…

K理论与同调 · 数学 2009-09-06 Andrew J. Blumberg , Michael A. Mandell

We reformulate the construction of Kontsevich's completion and use Lawson homology to define many new motivic invariants. We show that the dimensions of subspaces generated by algebraic cycles of the cohomology groups of two $K$-equivalent…

代数几何 · 数学 2008-07-10 Jyh-Haur Teh

This paper lays out the foundations of graded $K$-theory for Leavitt algebras associated with higher-rank graphs, also known as Kumjian-Pask algebras, establishing it as a potential tool for their classification. For a row-finite $k$-graph…

K理论与同调 · 数学 2026-05-27 Roozbeh Hazrat , Promit Mukherjee , David Pask , Sujit Kumar Sardar

Let $X$ be a simplicial set. We construct a novel adjunction between the categories of retractive spaces over $X$ and of $X_{+}$-comodules, then apply recent work on left-induced model category structures (arXiv:1401.3651v2…

代数拓扑 · 数学 2016-01-06 Kathryn Hess , Brooke Shipley

We generalize to higher algebraic $K$-theory an identity (originally due to Milnor) that relates the Reidemeister torsion of an infinite cyclic cover to its Lefschetz zeta function. Our identity involves a higher torsion invariant, the…

K理论与同调 · 数学 2022-06-22 John R. Klein , Cary Malkiewich

It is now well known that the K-theory of a Waldhausen category depends on more than just its (triangulated) homotopy category (see [Schlichting]). The purpose of this note is to show that the K-theory spectrum of a (good) Waldhausen…

K理论与同调 · 数学 2007-05-23 Bertrand Toen , Gabriele Vezzosi

I. Panin proved in the nineties that the algebraic K-theory of twisted projective homogeneous varieties can be expressed in terms of central simple algebras. Later, Merkurjev and Panin described the algebraic K-theory of toric varieties as…

代数几何 · 数学 2013-10-16 Goncalo Tabuada

Given an algebraic torus $T$ over a field $F$, its lattice of characters $\Lambda$ gives rise to a topological torus $\mathfrak{T}(T)=\Lambda_{\mathbb R}/\Lambda$ with a continuous action of the absolute Galois group $G$. We construct a…

K理论与同调 · 数学 2025-07-18 Qingyuan Bai , Shachar Carmeli , Branko Juran , Florian Riedel

Thomason's \'{e}tale descent theorem for Bott periodic algebraic $K$-theory \cite{aktec} is generalized to any $MGL$ module over a regular Noetherian scheme of finite dimension. Over arbitrary Noetherian schemes of finite dimension, this…

代数几何 · 数学 2022-06-29 Elden Elmanto , Marc Levine , Markus Spitzweck , Paul Arne Østvær

We show that the hermitian K-theory space of a commutative ring R can be identified, up to A^1-homotopy, with the group completion of the groupoid of oriented finite Gorenstein R-algebras, i.e., finite locally free R-algebras with…

代数几何 · 数学 2022-09-14 Marc Hoyois , Joachim Jelisiejew , Denis Nardin , Maria Yakerson