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15 include "ground/arith/nat_iter.ma".
16 include "ground/arith/nat_succ.ma".
18 (* SUCCESSOR FOR NON-NEGATIVE INTEGERS **************************************)
20 (* Constructions with niter *************************************************)
23 lemma niter_succ (A) (f) (n): f ∘ f^n ⊜ f^{A}(↑n).