Ltac CopR :=
 let tpoint := constr:(Tpoint) in
 let col := constr:(Col) in
 let cop := constr:(Coplanar) in
   assert_ncols; Cop_refl tpoint col cop.

Lemma osym_not_col : forall A B P P', Reflect P P' A B -> ~ Col A B P -> ~ Col A B P'.