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(* Formalization of the Chou, Gao and Zhang's decision procedure.          *)
(* Julien Narboux (Julien@narboux.fr)                                      *)
(* LIX/INRIA FUTURS 2004-2006                                              *)
(* University of Strasbourg 2008                                           *)
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(** Area elimination *)
(** on_line *)
(** on_line_d *)

Lemma test_area_on_line_d_1 : forall I B C, forall x:F,
on_line_d I B C x -> S B I C = 0.