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Countably compact group topologies on arbitrarily large free Abelian groups

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Author(s):
Bellini, Matheus K. ; Hart, Klaas Pieter ; Rodrigues, Vinicius O. ; Tomita, Artur H.
Total Authors: 4
Document type: Journal article
Source: Topology and its Applications; v. 333, p. 23-pg., 2023-04-28.
Abstract

We prove that if there are c incomparable selective ultrafilters then, for every infinite cardinal kappa such that kappa omega = kappa, there exists a group topology on the free Abelian group of cardinality kappa without nontrivial convergent sequences and such that every finite power is countably compact. In particular, there are arbitrarily large countably compact groups. This answers a 1992 question of D. Dikranjan and D. Shakhmatov.(c) 2023 Elsevier B.V. All rights reserved. (AU)

FAPESP's process: 17/15502-2 - Mad Families, Forcing and Combinatorial Principles in Topology
Grantee:Vinicius de Oliveira Rodrigues
Support Opportunities: Scholarships in Brazil - Doctorate
FAPESP's process: 21/00177-4 - Topological spaces and Set Theory
Grantee:Artur Hideyuki Tomita
Support Opportunities: Regular Research Grants
FAPESP's process: 16/26216-8 - Topology and sets
Grantee:Artur Hideyuki Tomita
Support Opportunities: Regular Research Grants
FAPESP's process: 17/15709-6 - Ultrafilters and Topological Algebra
Grantee:Matheus Koveroff Bellini
Support Opportunities: Scholarships in Brazil - Doctorate