fact: Definition NOU {X: Const} n (I: orduni n X) := exists Delta sigma, Delta ⊩(n) sigma : Gamma₀ /\ sigma • s₀ ≡ sigma • t₀ /\ forall x, normal (sigma x).
imports: List Lia Morphisms Undecidability.HOU(std.std calculus.calculus unification.higher_order_unification unification.systemunification)