1 (* Copyright (C) 2004, HELM Team.
3 * This file is part of HELM, an Hypertextual, Electronic
4 * Library of Mathematics, developed at the Computer Science
5 * Department, University of Bologna, Italy.
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15 * GNU General Public License for more details.
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26 (* $Id: number_notation.ml 9771 2009-05-14 13:43:55Z fguidi $ *)
29 raise (DisambiguateTypes.Invalid_choice (lazy (Stdpp.dummy_loc, msg)))
31 let build_nat o s str =
32 let n = int_of_string str in
33 if n < 0 then error (str ^ " is not a valid natural number number") else
34 let rec aux n = if n = 0 then o () else s (aux (pred n)) in
37 let ninterp_natural_number num =
39 let nat_URI = match Obj.nat_URI () with
41 | None -> error "no default natural numbers"
44 let nat_URI = NUri.uri_of_string "cic:/matita/arithmetics/nat/nat.ind" in
47 (NReference.reference_of_spec nat_URI (NReference.Con (0,1,0))) in
51 (NReference.reference_of_spec nat_URI (NReference.Con (0,2,0)));