Speaker: Maya Verma
Date: December 04, 2025
Affiliation: TIFR, Mumbai

Abstract: In 1982, Leighton proved that any two finite graphs with a common cover admit a finite sheeted common cover. In this talk, I will introduce the combinatorial model $X_{m,n}$ for Baumslag-Solitar group $\mathrm{BS}(m,n)$, and classify for which pairs of integers $(m,n)$ Leighton’s theorem can be extended to the orbit space of covering actions on $X_{m,n}$.