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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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(* Ratios elimination *)
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Lemma test_on_line_4 : forall I X Y A B C ,
on_line I X Y -> B<>C -> parallel A I B C ->
False ->
A**I/B**C = 1.