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Mathematics Colloquium


Date:  Tuesday, April 04, 2017

Title:  Around Grothendieck's theory of dessins d'enfants

Abstract:  This will be mainly an expository talk aiming to explain the correspondence introduced by Grothendieck in the 80's between algebraic curves defined over number fields and a certain kind of graphs embedded in compact orientable surfaces that he called designs d'infants (= children's drawings). Towards the end of the talk I will attempt to mention two recent results obtained jointly with Andrei Jaikin-Zapirain concerning the action of the absolute Galois group $Gal(\overline{\mathbb{Q}}/\mathbb{Q})$ on regular dessins and on the topology of algebraic varieties defined over number fields.

Speaker:  Gabino Gonzalez-Diez
Institution:  Universidad Autonoma de Madrid


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