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4 (* ||A|| A project by Andrea Asperti *)
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15 include "delayed_updating/syntax/prototerm_constructors.ma".
16 include "ground/lib/subset_ext_equivalence.ma".
18 (* CONSTRUCTORS FOR PROTOTERM ***********************************************)
20 (* Constructions with equivalence for prototerm *****************************)
22 lemma iref_eq_repl (t1) (t2) (k):
23 t1 ⇔ t2 → 𝛕k.t1 ⇔ 𝛕k.t2.
24 /2 width=1 by subset_equivalence_ext_f1_bi/