Holomorphy
Formalization of complex analysis, following the closed #192.
@mkerjean @mkerjean CI fixed (cf https://github.com/math-comp/math-comp-nix/blob/e4d6c84698822d395832a6bc2c6d308356e2b08f/default.nix#L40)
FYI, for the proof of (Differentiable /\ Cauchy-Riemann => Holomorphic), I tried to reintroduce two normed structure on R[i], in order to use the theory of differentiability already developed. However, it is still difficult to handle, as basic computations do not perform easily https://github.com/math-comp/analysis/blob/e2bab6f145d62cde3c15472175983733989e6e14/theories/holomorphy.v#L547. Would that be something which could be solved by this branch of real-closed @CohenCyril ?