https://github.com/math-comp/analysis/blob/723425a8e25ee4d32ff8409d0294d25d4e43f9ad/theories/topology_theory/pseudometric_structure.v#L77 but how? @CohenCyril @mkerjean
analysis/theories/topology_theory/pseudometric_structure.v
Line 77 in 723425a
but how? @CohenCyril @mkerjean