Hint Resolve Neg_apart_equiv.
Definition EqPt := Negation Point DiPt.
Definition EqLn := Negation Line DiLn.
Definition Par := Negation Line ConLn.

(* Specifications: *)
Theorem equiv_EqPt : Equivalence Point EqPt.
Hint Resolve equiv_EqPt.
Theorem equiv_EqLn : Equivalence Line EqLn.
Hint Resolve equiv_EqLn.
Theorem equiv_Par : Equivalence Line Par.
Hint Resolve equiv_Par.
Theorem sym_EqPt : forall x y : Point, EqPt x y -> EqPt y x.
Theorem sym_EqLn : forall x y : Line, EqLn x y -> EqLn y x.
Theorem sym_Par : forall x y : Line, Par x y -> Par y x.
Hint Immediate sym_EqPt sym_EqLn sym_Par.