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4 (* ||A|| A project by Andrea Asperti *)
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15 include "ground_2/relocation/nstream.ma".
17 (* RELOCATION MAP ***********************************************************)
19 lemma pn_split: ∀f. (∃g. ↑g = f) ∨ (∃g. ⫯g = f).
20 @case_prop /3 width=2 by or_introl, or_intror, ex_intro/