(* Autor(s): Andrej Dudenhefner (1) Affiliation(s): (1) Saarland University, Saarbrücken, Germany *)
From Undecidability.SystemF.Util Require Import Facts poly_type_facts pure_term_facts.

Lemma subst_term_up_term_term_var {σ t}: subst_term σ (up_term_term var) t = subst_term σ var t.