I can't find anywhere a proof of the following comparison isomorphishm:
$$H^1_{dR}(E)\otimes \mathbb{C}=H^1_{et}(E)\otimes \mathbb{C}$$
where $E$ is an elliptic curve over $\mathbb{C}$.
Any reference would be appreciated.
On a side note, is the isomorphism true for $n>1$?