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math.LO2025
Computable Bases
Vasco Brattka, Emmanuel Rauzy
In computable analysis typically topological spaces with countable bases are considered. The Theorem of Kreitz-Weihrauch implies that the subbase representation of a second-countab…
math.LO2025
Effective bases and notions of effective second countability in computable analysis
Vasco Brattka, Emmanuel Rauzy
We investigate different notions of "computable topological base" for represented spaces. We show that several non-equivalent notions of bases become equivalent when we consider co…
math.GR2025
A robust family of residually finite groups; spectra of residual finiteness growth, computability properties, and other applications (with an appendix by Arman Darbinyan and Emmanuel Rauzy)
Arman Darbinyan, Emmanuel Rauzy
In this paper, we introduce a family of residually finite groups that helps us to systematically study the residual finiteness growth function (RFG) from various perspectives. Firs…