fact: Definition isassoc_plusNonnegativeReals: ∏ x y z : NonnegativeReals, x + y + z = x + (y + z) := isassoc_CCDRplus (X := NonnegativeReals).
imports: UniMath.MoreFoundations.Orders UniMath.MoreFoundations.Tactics UniMath.MoreFoundations.Notations UniMath.RealNumbers.Sets UniMath.Algebra.ConstructiveStructures UniMath.OrderTheory.Lattice.Lattice UniMath.RealNumbers.Prelim UniMath.RealNumbers.NonnegativeRationals