I live in a little beautiful town, Santander in the north coast of Spain and I want to give my congratulations to a local mathematician Francisco Santos who has refuted the Hirsch conjecture.

**Conjecture** Let be a convex –polytope with facets. Then the diameter of the graph of the polytope is at most .

What haven’t been proved for d≥4 and remains unresolved for 50 years.

The proof will be presented at the 100 Years in Seattle (The mathematics of Klee and Grunbaum) conference in end-July, this year.

But there is even an entry in the Wikipedia and a lot of references in the web, what as I’ve read in the local newspaper interview, astonished Francisco Santos for such a quick reaction in the emedia.

Here you have a part of this work published a few months ago December 2009

My humble congratulations.