(* * Copyright (c) 2009 Robert Dockins and Aquinas Hobor. * *)
(* Coq development: using indirection theory to model types in l-calculus *)
(* Typing rules *)

(* Specifications: *)
Lemma T_weaken : forall G G' e tau,
Typ G e tau ->
Typ (G++G') e tau.
Lemma T_weaken_nil : forall G e tau,
Typ nil e tau ->
Typ G e tau.