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4 (* ||A|| A project by Andrea Asperti *)
6 (* ||I|| Developers: *)
7 (* ||T|| The HELM team. *)
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11 (* v GNU General Public License Version 2 *)
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15 include "delayed_updating/reduction/dfr.ma".
16 include "delayed_updating/reduction/ifr.ma".
17 include "delayed_updating/substitution/fsubst_lift.ma".
19 (* DELAYED FOCUSED REDUCTION ************************************************)
21 lemma dfr_lift_bi (f) (p) (q) (t1) (t2): ÆŽt1 â
22 t1 âĄðð[p,q] t2 â â[f]t1 âĄð[âp,âq] â[f]t2.