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We face the problem of characterizing the periodic cases in parametric families of (real or complex) rational diffeomorphisms having a fixed point. Our approach relies on the Normal Form Theory, to obtain necessary conditions for the…

Dynamical Systems · Mathematics 2015-02-19 Anna Cima , Armengol Gasull , Víctor Mañosa

All counterexamples of Pinchuk type to the strong real Jacobian conjecture are shown to have rational function field extensions of degree six with no nontrivial automorphisms.

Algebraic Geometry · Mathematics 2013-11-18 L. Andrew Campbell

Following recent work of R. Cluckers and F. Loeser [Fonctions constructible et integration motivic I, C. R. Math. Acad. Sci. Paris 339 (2004) 411 - 416] on motivic integration, we develop a direct image formalism for positive constructible…

Logic · Mathematics 2014-04-29 R. Cluckers , M. Edmundo

We study fundamental groups of algebraic stacks. We show that these fundamental groups carry an additional structure coming from the inertia groups. Then use this additional structure to analyze geometric/ topological properties of stacks.…

Algebraic Geometry · Mathematics 2007-05-23 Behrang Noohi

We introduce a direct image formalism for constructible motivic functions. One deduces a very general version of motivic integration for which a change of variables theorem is proved. These constructions are generalized to the relative…

Algebraic Geometry · Mathematics 2007-05-23 R. Cluckers , F. Loeser

We study structural limitations of purely algebraic reasoning in the analysis of arithmetic dynamical systems. Rather than addressing the truth of specific conjectures, we introduce a fragment - relative notion of algebraic refutability for…

General Mathematics · Mathematics 2026-02-09 Madhav Dhiman , Rohan Pandey

We develop a 6-functor formalism $\mathcal{D}_{[0,\infty)}(-)$ with $\mathbb{Z}_p$-linear coefficients on small v-stacks, and discuss consequences for duality and finiteness for pro-\'etale cohomology of rigid-analytic varieties of general…

Algebraic Geometry · Mathematics 2024-12-31 Johannes Anschütz , Arthur-César Le Bras , Lucas Mann

In this sequel of arXiv:1211.5294 and arXiv:1211.5948, we develop an adic formalism for \'etale cohomology of Artin stacks and prove several desired properties including the base change theorem. In addition, we define perverse t-structures…

Algebraic Geometry · Mathematics 2017-09-27 Yifeng Liu , Weizhe Zheng

We define a family of intuitionistic non-normal modal logics; they can bee seen as intuitionistic counterparts of classical ones. We first consider monomodal logics, which contain only one between Necessity and Possibility. We then consider…

Logic in Computer Science · Computer Science 2019-01-30 Tiziano Dalmonte , Charles Grellois , Nicola Olivetti

The de Rham stack construction of Simpson shows that D-modules are quasicoherent sheaves on a modified geometry. Drinfeld furthermore introduced the ring stack perspective (aka transmutation), which asserts that a coefficient theory is…

Algebraic Geometry · Mathematics 2026-03-03 Ko Aoki

We prove that the rational Chow motive of a six dimensional hyper-K\"{a}hler variety obtained as symplectic resolution of O'Grady type of a singular moduli space of semistable sheaves on an abelian surface $A$ belongs to the tensor category…

Algebraic Geometry · Mathematics 2026-03-04 Salvatore Floccari

This is an expended and revised version of the preprint "Schematization of homotopy types". The purpose of this work is to introduce a notion of \emph{affine stacks}, which is a homotopy version of the notion of affine schemes, and to give…

Algebraic Geometry · Mathematics 2007-05-23 B. Toen

Let $\mathbb{k}$ be a field of characteristic $p$. We introduce a formalism of mixed sheaves with coefficients in $\mathbb{k}$ and showcase its use in representation theory. More precisely, we construct for all quasi-projective schemes $X$…

Representation Theory · Mathematics 2019-04-16 Jens Niklas Eberhardt , Shane Kelly

We study categories of matrix factorizations. These categories are defined for any regular function on a suitable regular scheme. Our paper has two parts. In the first part we develop the foundations; for example we discuss derived direct…

Algebraic Geometry · Mathematics 2013-10-25 Valery A. Lunts , Olaf M. Schnürer

The main purpose of this paper is to define dynamical degrees for rational maps over an algebraic closed field of characteristic zero and prove some basic properties (such as log-concavity) and give some applications. We also define…

Algebraic Geometry · Mathematics 2015-01-08 Tuyen Trung Truong

In this paper we study the behaviour of modules over finite dimensional algebras whose endomorphism algebra is a division ring. We show that there are finitely many such modules in the module category of an algebra if and only if the length…

Representation Theory · Mathematics 2020-06-09 Sibylle Schroll , Hipolito Treffinger

Motivic characteristic classes of possibly singular algebraic varieties are homology class versions of motivic characteristics, not classes in the so-called motivic (co)homology. This paper is a survey on them with more emphasis on…

Algebraic Geometry · Mathematics 2011-10-06 Shoji Yokura

Let $X$ be a smooth projective curve over a field of characteristic zero and let $\mathcal D$ be an effective divisor on $X$. We calculate motivic classes of various moduli stacks of parabolic vector bundles with irregular connections on…

Algebraic Geometry · Mathematics 2024-04-25 Roman Fedorov , Alexander Soibelman , Yan Soibelman

We study a formal deformation problem for rational algebraic cycle classes motivated by Grothendieck's variational Hodge conjecture. We argue that there is a close connection between the existence of a Chow-K\"unneth decomposition and the…

Algebraic Geometry · Mathematics 2014-02-25 Spencer Bloch , Hélène Esnault , Moritz Kerz

For noetherian schemes of finite dimension over a field of characteristic exponent $p$, we study the triangulated categories of $\mathbf{Z}[1/p]$-linear mixed motives obtained from cdh-sheaves with transfers. We prove that these have many…

Algebraic Geometry · Mathematics 2016-10-05 Denis-Charles Cisinski , Frédéric Déglise