fact: Definition fcompose A B C (f : B -> C) (g: A -> B) x := f (g x).
imports: Arith micromega.Lia Setoid IndefiniteDescription ClassicalChoice HahnBase HahnList HahnEquational HahnRewrite HahnRelationsBasic HahnSets HahnNatExtra HahnListBefore HahnWf HahnSorted HahnTotalExt