Module Type ext_wf_sig.

Axiom Typing_lc  : forall G0 a A, Typing G0 a A -> lc_tm a /\ lc_tm A.
Axiom PropWff_lc : forall G0 phi,   PropWff G0 phi -> lc_constraint phi.
Axiom Iso_lc : forall G0 D p1 p2, Iso G0 D p1 p2 -> lc_constraint p1 /\ lc_constraint p2.
Axiom DefEq_lc : forall G0 D A B T,   DefEq G0 D A B T -> lc_tm A /\ lc_tm B /\ lc_tm T.