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Grothendieck gave two forms of his "main conjecture of anabelian geometry", i.e. the section conjecture and the hom conjecture. He stated that these two forms are equivalent and that if they hold for hyperbolic curves then they hold for…

Algebraic Geometry · Mathematics 2021-01-21 Giulio Bresciani

In this short note, we will give the key point of the section conjecture of Grothendieck, that is reformulated by monodromy actions. Here, we will also give the result of the section conjecture for algebraic schemes over a number field.

Algebraic Geometry · Mathematics 2009-11-24 Feng-Wen An

We define model category structures on the category of chain complexes over a Grothendieck abelian category depending on the choice of a generating family, and we study their behaviour with respect to tensor products and stabilization. This…

Category Theory · Mathematics 2007-12-21 Denis-Charles Cisinski , Frédéric Déglise

The aim of this project is to attach a geometric structure to the ring of integers. It is generally assumed that the spectrum $\mathrm{Spec}(\mathbb{Z})$ defined by Grothendieck serves this purpose. However, it is still not clear what…

Logic · Mathematics 2016-09-26 Boris Zilber , Lubna Shaheen

Representations over diagrams of abelian categories unify quite a few notions appearing widely in literature such as representations of categories, presheaves of modules over categories, representations of species, etc. In this series of…

Representation Theory · Mathematics 2023-08-01 Zhenxing Di , Liping Li , Li Liang , Nina Yu

We present a conjecture in Diophantine geometry concerning the construction of line bundles over smooth projective varieties over $\bar{\mathbb Q}}$. This conjecture, closely related to the Grothendieck Period Conjecture for cycles of…

Algebraic Geometry · Mathematics 2016-02-10 Jean-Benoit Bost

We develop a comprehensive theory of the stable representation categories of several sequences of groups, including the classical and symmetric groups, and their relation to the unstable categories. An important component of this theory is…

Representation Theory · Mathematics 2015-06-17 Steven V Sam , Andrew Snowden

This paper studies the homotopy theory of the Grothendieck construction using model categories and semi-model categories, provides a unifying framework for the homotopy theory of operads and their algebras and modules, and uses this…

Algebraic Topology · Mathematics 2026-05-20 Michael Batanin , Florian De Leger , David White

In the present paper, we study a new kind of anabelian phenomenon concerning the smooth pointed stable curves in positive characteristic. It shows that the topological structures of moduli spaces of curves can be understood from the…

Algebraic Geometry · Mathematics 2023-01-13 Zhi Hu , Yu Yang , Runhong Zong

The toric fundamental group is the Tannaka dual of a category of vector bundles which become direct sums of line bundles on a finite \'etale cover. It is an extension of the \'etale fundamental group scheme by a projective limit of tori.…

Algebraic Geometry · Mathematics 2025-05-02 Giulio Bresciani

We propose a framework for model-theoretic stability and simplicity in an approximate first-order setting and generalize some classical results.

Logic · Mathematics 2026-04-27 Alexander Burka

We develop some aspects of the theory of derivators, pointed derivators, and stable derivators. As a main result, we show that the values of a stable derivator can be canonically endowed with the structure of a triangulated category.…

Algebraic Topology · Mathematics 2014-10-01 Moritz Groth

For a (semi-)model category M, we define a notion of a ''homotopy'' Grothendieck topology on M, as well as its associated model category of stacks. We use this to define a notion of geometric stack over a symmetric monoidal base model…

Algebraic Geometry · Mathematics 2007-05-23 Bertrand Toen , Gabriele Vezzosi

We begin a systematic development of structure theory for a first order theory, which is stable over a monadic predicate. We show that stability over a predicate implies quantifier free definability of types over stable sets, introduce an…

Logic · Mathematics 2023-02-17 Saharon Shelah , Alexander Usvyatsov

In this paper, we extend bottleneck stability to the setting of one dimensional constructible persistences module valued in any small abelian category.

Algebraic Topology · Mathematics 2020-09-09 Alex McCleary , Amit Patel

We establish a valuative version of Grothendieck's section conjecture for curves over p-adic local fields. The image of every section is contained in the decomposition subgroup of a valuation which prolongs the p-adic valuation to the…

Algebraic Geometry · Mathematics 2011-11-08 Florian Pop , Jakob Stix

We discuss the towers of finite \'etale covers which were essentially introduced by A.Tamagawa. The statement about correspondence between sections and cofinal towers is a folklore but perhaps not in a very explicit form. The last section…

Algebraic Geometry · Mathematics 2021-04-13 Boris Zilber

Using the identification of sections of the Galois group of the ground field into the arithmetic fundamental group with neutral fiber functors of the category of finite connections, we define the "packets" in Grothendieck's section…

Number Theory · Mathematics 2019-05-20 Hélène Esnault , Phùng Hô Hai

We establish an algebra-isomorphism between the complexified Grothendieck ring F of certain bimodule categories over a modular tensor category and the endomorphism algebra of appropriate morphism spaces of those bimodule categories. This…

Category Theory · Mathematics 2009-02-24 Jurgen Fuchs , Ingo Runkel , Christoph Schweigert

We construct a "diagonal" cofibrantly generated model structre on the category of simplicial objects in the category of topological categories sCat_{Top}, which is the category of diagrams [\Delta^{op}, Cat_{Top}]. Moreover, we prove that…

Algebraic Topology · Mathematics 2011-12-07 Ilias Amrani
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