src/ZF/ex/bin.ML
 author lcp Tue Aug 16 18:58:42 1994 +0200 (1994-08-16) changeset 532 851df239ac8b parent 71 729fe026c5f3 permissions -rw-r--r--
ZF/Makefile,ROOT.ML, ZF/ex/Integ.thy: updated for EquivClass
```     1 (*  Title: 	ZF/ex/bin.ML
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```     2     ID:         \$Id\$
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```     3     Author: 	Lawrence C Paulson, Cambridge University Computer Laboratory
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```     4     Copyright   1993  University of Cambridge
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```     5
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```     6 Datatype of binary integers
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```     7 *)
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```     8
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```     9 (*Example of a datatype with an infix constructor*)
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```    10 structure Bin = Datatype_Fun
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```    11  (val thy = Univ.thy;
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```    12   val rec_specs =
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```    13       [("bin", "univ(0)",
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```    14 	  [(["Plus", "Minus"],	"i"),
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```    15 	   (["op \$\$"],		"[i,i]=>i")])];
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```    16   val rec_styp = "i";
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```    17   val ext = Some (Syntax.simple_sext [Infixl("\$\$", "[i,i] => i", 60)]);
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```    18   val sintrs =
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```    19 	  ["Plus : bin",
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```    20 	   "Minus : bin",
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```    21 	   "[| w: bin;  b: bool |] ==> w\$\$b : bin"];
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```    22   val monos = [];
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```    23   val type_intrs = datatype_intrs @ [bool_into_univ];
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```    24   val type_elims = []);
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```    25
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```    26 (*Perform induction on l, then prove the major premise using prems. *)
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```    27 fun bin_ind_tac a prems i =
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```    28     EVERY [res_inst_tac [("x",a)] Bin.induct i,
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```    29 	   rename_last_tac a ["1"] (i+3),
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```    30 	   ares_tac prems i];
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```    31
```