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This paper proves various results concerning non-ergodic actions of locally compact groups and particularly Borel cocycles defined over such actions. The general philosophy is to reduce the study of the cocycle to the study of its…

Dynamical Systems · Mathematics 2007-05-23 D. Fisher , D. Morris , K. Whyte

We study the algebraic $K$-theory of the ring of continuous functions on a compact Hausdorff space with values in a local division ring, e.g., a local field: We compute its negative $K$-theory and show its $K$-regularity. The complex case…

K-Theory and Homology · Mathematics 2024-02-09 Ko Aoki

We propose the operatorial form of Baxter's TQ-relations in a general form of the operatorial B\"acklund flow describing the nesting process for the inhomogeneous rational gl(K|M) quantum (super)spin chains with twisted periodic boundary…

Mathematical Physics · Physics 2012-04-18 Vladimir Kazakov , Sebastien Leurent , Zengo Tsuboi

Placing a Dirac-Schr\"odinger operator along the orbit of a flow on a compact manifold \(M\) defines an \(\R\)-equivariant spectral triple over the algebra of smooth functions on \(M\). We study some of the properties of these triples,…

K-Theory and Homology · Mathematics 2021-08-13 Nathaniel Butler , Heath Emerson , Tyler Schulz

We describe additive (unstable) operations from a theory A^* obtained from Algebraic Cobordism of M.Levine-F.Morel by change of coefficients to any oriented cohomology theory B^*. We prove that there is 1-to-1 correspondence between the set…

Algebraic Geometry · Mathematics 2017-11-15 Alexander Vishik

This work studies slice functions over finite-dimensional division algebras. Their zero sets are studied in detail along with their multiplicative inverses, for which some unexpected phenomena are discovered. The results are applied to…

Complex Variables · Mathematics 2020-07-15 Riccardo Ghiloni , Alessandro Perotti , Caterina Stoppato

We define a theory of etale motives over a noetherian scheme. This provides a system of categories of complexes of motivic sheaves with integral coefficients which is closed under the six operations of Grothendieck. The rational part of…

Algebraic Geometry · Mathematics 2019-02-20 Denis-Charles Cisinski , Frédéric Déglise

We propose a generalization of K-theory to operator systems. Motivated by spectral truncations of noncommutative spaces described by $C^*$-algebras and inspired by the realization of the K-theory of a $C^*$-algebra as the Witt group of…

Operator Algebras · Mathematics 2024-09-05 Walter D. van Suijlekom

The theory of secondary chomology operations leads to a conjecture concerning the algebra of higher cohomology operations in general. This conjecture is discussed here in detail and its connection with homotopy groups of spheres and the…

Algebraic Topology · Mathematics 2008-07-02 Hans Joachim Baues

We study equivariant operations on the periodic cyclic homology of a dg algebra that arise from the chain level action of the two-colored Kontsevich-Soibelman operad. Using classical computations of Cohen [Coh], we explicitly compute a set…

Quantum Algebra · Mathematics 2026-01-26 Zihong Chen

We add analytic components to algebraic cycles with modulus and define an arithmetic Chow group with modulus that resembles the classical arithmetic Chow groups by Gillet and Soul\'e. The analytic component is dictated by imposing a…

Algebraic Geometry · Mathematics 2025-01-08 Souvik Goswami , Rahul Gupta

It is proved that for a commutative noetherian ring with dualizing complex the homotopy category of projective modules is equivalent, as a triangulated category, to the homotopy category of injective modules. Restricted to compact objects,…

Commutative Algebra · Mathematics 2007-05-23 Srikanth Iyengar , Henning Krause

We describe all operations from a theory A^* obtained from Algebraic Cobordism of M.Levine-F.Morel by change of coefficients to any oriented cohomology theory B^* (in the case of a field of characteristic zero). We prove that such an…

Algebraic Geometry · Mathematics 2020-02-17 Alexander Vishik

We develop a version of controlled algebra for simplicial rings. This generalizes the methods which lead to successful proofs of the algebraic K- theory isomorphism conjecture (Farrell-Jones Conjecture) for a large class of groups. This is…

K-Theory and Homology · Mathematics 2014-06-24 Mark Ullmann

We prove a decomposition theorem for the equivariant K-theory of actions of affine group schemes G of finite type over a field on regular separated noetherian algebraic spaces, under the hypothesis that the actions have finite geometric…

Algebraic Geometry · Mathematics 2007-05-23 Gabriele Vezzosi , Angelo Vistoli

We prove a functional transcendence theorem for the integrals of algebraic forms in families of algebraic varieties. This allows us to prove a geometric version of Andr\'e's generalization of the Grothendieck period conjecture, which we…

Algebraic Geometry · Mathematics 2023-12-08 Ben Bakker , Jacob Tsimerman

We study families of partitions with gap conditions that were introduced by Schur and Andrews, and describe their fundamental connections to combinatorial q-series and automorphic forms. In particular, we show that the generating functions…

Number Theory · Mathematics 2013-07-09 Kathrin Bringmann , Karl Mahlburg

Smith theory says that the fixed point of a semi-free action of a group $G$ on a contractible space is ${\bb Z}_p$-acyclic for any prime factor $p$ of $G$. Jones proved the converse of Smith theory for the case $G$ is a cyclic group acting…

Algebraic Topology · Mathematics 2022-02-21 Sylvain Cappell , Shmuel Weinberger , Min Yan

A part of Grothendieck's program for studying the Galois group $G_{\mathbb Q}$ of the field of all algebraic numbers $\overline{\mathbb Q}$ emerged from his insight that one should lift its action upon $\overline{\mathbb Q}$ to the action…

Algebraic Geometry · Mathematics 2020-06-25 Noemie C. Combe , Yuri I. Manin , Matilde Marcolli

We define a cocycle on the group of symplectic diffeomorphisms of a symplectic manifold and investigate its properties. The main applications are concerned with symplectic actions of discrete groups. For example, we give an alternative…

Symplectic Geometry · Mathematics 2011-02-10 Swiatoslaw R. Gal , Jarek Kedra