(**************** EXT Weak ****************)
Module Type ext_weak_sig.
Include ext_wf_sig.

Axiom remove_available_mutual:
(forall G1  a A,   Typing G1 a A -> True) /\
(forall G1  phi,   PropWff G1 phi -> True) /\
(forall G1 D p1 p2, Iso G1 D p1 p2 ->
Iso G1 (AtomSetImpl.inter D (dom G1)) p1 p2) /\
(forall G1 D A B T,   DefEq G1 D A B T ->
DefEq G1 (AtomSetImpl.inter D (dom G1)) A B T) /\
(forall G1 ,       Ctx G1 -> True).