Module Type ext_wf_sig.

Axiom DefEq_lc1 : forall G0 D A B T,   DefEq G0 D A B T -> lc_tm A.
Axiom DefEq_lc2 : forall G0 D A B T,   DefEq G0 D A B T -> lc_tm B.
Axiom DefEq_lc3 : forall G0 D A B T,   DefEq G0 D A B T -> lc_tm T.