== External links ==* Grothendieck Circle, collection of mathematical and biographical information, photos, links to his writings* Institut des Hautes Études Scientifiques* The origins of `Pursuing Stacks' This is an account of how `Pursuing Stacks' was written in response to a correspondence in English with Ronnie Brown and Tim Porter at Bangor, which continued until 1991.
The life of Alexandre Grothendieck* Grothendieck Circle, collection of mathematical and biographical information, photos, links to his writings** Grothendieck Circle discussion Forum* Institut des Hautes Études Scientifiques* The origins of `Pursuing Stacks' This is an account of how `Pursuing Stacks' was written in response to a correspondence in English with Ronnie Brown and Tim Porter at Bangor, which continued until 1991.