CMUP PhD Informal Seminar - Omega presentations

This talk is about some special type of profinite presentations called ω-presentations. In 2013, J. Almeida and A. Costa showed how these presentations arise naturally for certain profinite groups corresponding to primitive substitutions. In that context, ω-presentations can be concretely computed with a device called return substitution, a combinatorial construction introduced by F. Durand in 1998. I will present some examples and share stories of my ongoing quest to understand how these presentations can be used in practice.

Date and Venue

Start Date
Online Zoom meeting
End Date


Herman Goulet Ouellet

Speaker's Institution

UC|UP Joint PhD Program


CMUP Informal PHD Seminar