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14
15 include "ground/notation/functions/element_i_0.ma".
16 include "ground/relocation/tr_pn.ma".
17
18 (* IDENTITY ELEMENT FOR TOTAL RELOCATION MAPS *******************************)
19
20 corec definition tr_id: tr_map ≝ ⫯tr_id.
21
22 interpretation
23   "identity element (total relocation streams)"
24   'ElementI = (tr_id).
25
26 (* Basic constructions (specific) *******************************************)
27
28 lemma tr_id_unfold: ⫯𝐢 = 𝐢.
29 <(stream_unfold … (𝐢)) in ⊢ (???%); //
30 qed.