Venue
Aula Bianchi Lettere - Palazzo della Carovana
Abstract
The operation of folding on graphs, introduced for the first time by Stallings, is a fundamental tool in studying many properties of free groups. During the talk, we introduce this notion and we show some of its first and most important applications: these include the solution to the subgroup membership problem, Marshall Hall’s theorem and Howson’s theorem.
Further information is available on the babygeometri website.