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15 set "baseuri" "cic:/matita/LOGIC/PNF/defs".
17 (* NORMAL FORM PREDICATE FOR PARALLEL REDUCTION
20 include "PRed/defs.ma".
22 inductive PNF: Proof \to Prop \def
23 | pnf: \forall p. (\forall q. p => q \to p = q) \to PNF p