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15 set "baseuri" "cic:/matita/RELATIONAL-ARITHMETICS/NPlus".
17 include "logic/equality.ma".
21 inductive NPlus (p:Nat): Nat \to Nat \to Prop \def
22 | NPlus_zero_2: NPlus p zero p
23 | NPlus_succ_2: \forall q, r. NPlus p q r \to NPlus p (succ q) (succ r).