Free groups and Stallings’ folding – Dario Ascari (Oxford University)


Aula Bianchi Lettere - Palazzo della Carovana


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.

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