formulas(usable).

all x all F ((Object(x) & Property(F)) -> ((exists d (Point(d) & EncAt(x,F,d))) -> (all d (Point(d) -> EncAt(x,F,d))))).

all x all p all d ((Object(x) & Proposition(p) & Point(d)) -> (EncpAt(x,p,d) <-> (exists F (Property(F) & F=VAC(p) & EncAt(x,F,d))))).

all p all x all d ((Object(x) & Proposition(p) & Point(d)) -> (TrueInAt(p,x,d) <-> EncpAt(x,p,d))).
end_of_list.

