(* * Copyright (c) 2009 Robert Dockins and Aquinas Hobor. * *)
(* Coq development: using indirection theory to model types in l-calculus *)
(* lam_ref_mach_lemmas.v: various boring lemmas about the machine *)
(* COERCIONS *)
(* DECIDABILTY *)
(* SUBSTITUTION *)
(* STEP RELATION *)

Lemma step_deterministic: forall m e m1 e1 m2 e2,
step (m,e) (m1,e1) ->
step (m,e) (m2,e2) ->
m1 = m2 /\ e1 = e2.