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15 include "ground_2/notation/functions/identity_0.ma".
16 include "ground_2/relocation/rtmap_isid.ma".
18 (* RELOCATION N-STREAM ******************************************************)
20 (* Specific inversion lemmas ************************************************)
22 lemma isid_inv_seq: ∀f,n. 𝐈⦃n⨮f⦄ → 𝐈⦃f⦄ ∧ 0 = n.
23 #f #n #H elim (isid_inv_gen … H) -H
24 #g #Hg #H elim (push_inv_seq_dx … H) -H /2 width=1 by conj/