fact: Definition CRmin_idem : forall x : CR, CRmin x x == x := @meet_idem (sl CRlat).
imports: CoRN.algebra.RSetoid CoRN.metric2.Metric CoRN.metric2.UniformContinuity CoRN.model.partialorder.CRpartialorder CoRN.order.SemiLattice CoRN.order.Lattice