He also worked closely with Jean-Pierre Serre, leading to important results on the l-adic representations attached to modular forms, and the conjectural functional equations of L-functions.
Siya rin ay nagtrabaho malapit sa Jean-Pierre Serre, humahantong sa mahalagang mga resulta sa l-adic isinasaad ang nakalakip sa modular form, at sa palagay functional equation ng L-function.