December 7, 1998. A.D.Suvorov (Moscow). Grothendieck Programme for Plane Trees. Combinatorics and Arithmetics.

Outline:
- General introduction to the Grothendieck Theory of Dessins d'Enfants for the case of plane trees.
- Absolute Galois group action on the set of plane trees and its invariants.
- Composition of plane trees.

List of talks at previous sessions of the seminar.