A map is a graph which is drawn on a compact orientable surface. There exist various results relating the generating series of maps to the theory of symmetric functions. In this talk, I present two different approaches which allow to relate the…
Eventi
Rational approximations to linear subspaces – Nicolas de Saxcé (CNRS, Université Paris-Nord 13)
Dirichlet’s theorem in Diophantine approximation implies that for any real x, there exists a rational p/q arbitrarily close to x such that |x-p/q|<1/q^2. In addition, the exponent 2 that appears in this inequality is optimal, as seen for example by…
Divisible convex sets with properly embedded cones – Gabriele Viaggi (University of Heidelberg)
An open subset of real projective space is said to be properly convex if it is contained in an affine…