Beyond the lascar group

E Hrushovski - arXiv preprint arXiv:2011.12009, 2020 - arxiv.org
We work in a first-order setting where structures are spread out over a metric space, with
quantification allowed only over bounded subsets. Assuming a doubling property for the …

Definability patterns and their symmetries

E Hrushovski - arXiv preprint arXiv:1911.01129, 2019 - arxiv.org
We identify a canonical structure J associated to any first-order theory, the {\it space of
definability patterns}. It generalizes the imaginary algebraic closure in a stable theory, and …

Ellis groups in model theory and strongly generic sets

A Malinowski - arXiv preprint arXiv:2401.00327, 2023 - arxiv.org
Assume $ G $ is a group and $\mathcal {A} $ is an algebra of subsets of $ G $ closed under
left translation. We study various ways to understand the Ellis group of the $ G $-flow $ S …

Canonical quotients in model theory

AP Fernández - arXiv preprint arXiv:2412.14862, 2024 - arxiv.org
We study canonical quotients in model theory, mainly stable quotients of type-definable
groups and invariant types in NIP theories. We extend the modelling property to continuous …

Generalized locally compact models for approximate groups

K Krupiński, A Pillay - arXiv preprint arXiv:2310.20683, 2023 - arxiv.org
We give a proof of the existence of generalized definable locally compact models for
arbitrary approximate subgroups via an application of topological dynamics in model theory …

Ramsey theory and topological dynamics for first order theories

K Krupiński, J Lee, S Moconja - Transactions of the American Mathematical …, 2022 - ams.org
We investigate interactions between Ramsey theory, topological dynamics, and model
theory. We introduce various Ramsey-like properties for first order theories and characterize …

Maximal stable quotients of invariant types in NIP theories

K Krupiński, A Portillo - The Journal of Symbolic Logic, 2023 - cambridge.org
For a NIP theory T, a sufficiently saturated model equivalence relation on the set of
realizations of p which has stable quotient. This is a counterpart for equivalence relations of …

The relativized Lascar groups, type-amalgamation, and algebraicity

J Dobrowolski, B Kim, A Kolesnikov… - The Journal of Symbolic …, 2021 - cambridge.org
In this paper we study the relativized Lascar Galois group of a strong type. The group is a
quasi-compact connected topological group, and if in addition the underlying theory T is G …

Locally compact models for approximate rings

K Krupiński - Mathematische Annalen, 2024 - Springer
By an approximate subring of a ring we mean an additively symmetric subset X such that X·
X∪(X+ X) is covered by finitely many additive translates of X. We prove that each …

[PDF][PDF] Kanoniczne ilorazy w teorii modeli

AP Fernández - bip.uni.wroc.pl
Badamy pewne kanoniczne ilorazy w teorii modeli, głównie stabilne ilorazy grup typowo
definiowalnych oraz typów niezmienniczych w teoriach z własnością NIP. Główne wyniki …