During the whole period when he was based in Geneva he was working on his thesis on the cohomology with integer coefficients of Lie groups which he defended at the Sorbonne in Paris in the early part of 1952.
Sa buong panahon kapag siya ay batay sa Geneva siya ay nagtatrabaho sa kanyang tesis sa cohomology sa integer coefficients ng humiga / magsinungaling na grupo na kung saan siya defended sa Sorbonne sa Paris sa maagang bahagi ng 1952.