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4 (* ||A|| A project by Andrea Asperti *)
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7 (* ||T|| The HELM team. *)
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15 include "ground/relocation/gr_tl.ma".
16 include "ground/relocation/gr_isd.ma".
18 (* DIVERGENCE CONDITION FOR GENERIC RELOCATION MAPS *************************)
20 (* Constructions with gr_tl *************************************************)
23 lemma gr_isd_tl (f): 𝛀❪f❫ → 𝛀❪⫰f❫.
24 #f cases (gr_map_split_tl f) * #H
25 [ elim (gr_isd_inv_push … H) -H //
26 | /2 width=3 by gr_isd_inv_next/