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Oct 4, 2011 at 7:43 vote accept unramified
Oct 4, 2011 at 3:04 comment added Chandan Singh Dalawat Serre was trying to understand Ramanujan's congruences for the $\tau$-function, such as $\tau(p)\equiv1+p^{11}\mod{691}$ for every prime $p$. He (and Swinnerton-Dyer) realised that there is a Galois representation $\rho_\tau$ attached to $\tau$ and that the congruences for $\tau$ can be understood in terms of properties of $\rho_\tau$. This led him to conjecture that there is a Galois representation attached to every cuspidal eigenform, which was proved by Deligne in his Bourbaki talk.
Oct 4, 2011 at 2:35 history answered Emerton CC BY-SA 3.0