Page "André Weil" Paragraph 7

Other significant results were on Pontryagin duality and differential geometry.

He introduced the concept of a uniform space in general topology, as a by-product of his collaboration with Nicolas Bourbaki ( of which he was a Founding Father ).

His work on sheaf theory hardly appears in his published papers, but correspondence with Henri Cartan in the late 1940s, and reprinted in his collected papers, proved most influential.