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(* 02110-1301 USA                                                     *)
Section trajectory.
Unset Standard Proposition Elimination Names.
Variable intr : Trajectory.
Variable evad : EvaderTrajectory.
Variable T : TimeT.

(* Specifications: *)
Lemma thetat_derivable : derivable (thetat intr).
unfold thetat in |- *; apply (cond_diff (theta intr)).