diff -r f04b33ce250f -r a4dc62a46ee4 subtype.ML
--- a/subtype.ML	Tue Oct 24 14:59:17 1995 +0100
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,141 +0,0 @@
-(*  Title:      HOL/subtype.ML
-    ID:         $Id$
-    Author:     Markus Wenzel, TU Muenchen
-
-Internal interface for subtype definitions.
-*)
-
-signature SUBTYPE =
-sig
-  val prove_nonempty: cterm -> thm list -> tactic option -> thm
-  val add_subtype: string -> string * string list * mixfix ->
-    string -> string list -> thm list -> tactic option -> theory -> theory
-  val add_subtype_i: string -> string * string list * mixfix ->
-    term -> string list -> thm list -> tactic option -> theory -> theory
-end;
-
-structure Subtype: SUBTYPE =
-struct
-
-open Syntax Logic HOLogic;
-
-
-(* prove non-emptyness of a set *)   (*exception ERROR*)
-
-val is_def = is_equals o #prop o rep_thm;
-
-fun prove_nonempty cset thms usr_tac =
-  let
-    val {T = setT, t = set, maxidx, sign} = rep_cterm cset;
-    val T = dest_setT setT;
-    val goal =
-      cterm_of sign (mk_Trueprop (mk_mem (Var (("x", maxidx + 1), T), set)));
-    val tac =
-      TRY (rewrite_goals_tac (filter is_def thms)) THEN
-      TRY (REPEAT_FIRST (resolve_tac (filter_out is_def thms))) THEN
-      if_none usr_tac (TRY (ALLGOALS (fast_tac set_cs)));
-  in
-    prove_goalw_cterm [] goal (K [tac])
-  end
-  handle ERROR =>
-    error ("Failed to prove non-emptyness of " ^ quote (string_of_cterm cset));
-
-
-(* ext_subtype *)
-
-fun ext_subtype prep_term name (t, vs, mx) raw_set axms thms usr_tac thy =
-  let
-    val _ = require_thy thy "Set" "subtype definitions";
-    val sign = sign_of thy;
-
-    (*rhs*)
-    val cset = prep_term sign raw_set;
-    val {T = setT, t = set, ...} = rep_cterm cset;
-    val rhs_tfrees = term_tfrees set;
-    val oldT = dest_setT setT handle TYPE _ =>
-      error ("Not a set type: " ^ quote (Sign.string_of_typ sign setT));
-
-    (*lhs*)
-    val lhs_tfrees =
-      map (fn v => (v, if_none (assoc (rhs_tfrees, v)) termS)) vs;
-
-    val tname = type_name t mx;
-    val tlen = length vs;
-    val newT = Type (tname, map TFree lhs_tfrees);
-
-    val Rep_name = "Rep_" ^ name;
-    val Abs_name = "Abs_" ^ name;
-    val setC = Const (name, setT);
-    val RepC = Const (Rep_name, newT --> oldT);
-    val AbsC = Const (Abs_name, oldT --> newT);
-    val x_new = Free ("x", newT);
-    val y_old = Free ("y", oldT);
-
-    (*axioms*)
-    val rep_type = mk_Trueprop (mk_mem (RepC $ x_new, setC));
-    val rep_type_inv = mk_Trueprop (mk_eq (AbsC $ (RepC $ x_new), x_new));
-    val abs_type_inv = mk_implies (mk_Trueprop (mk_mem (y_old, setC)),
-      mk_Trueprop (mk_eq (RepC $ (AbsC $ y_old), y_old)));
-
-
-    (* errors *)
-
-    val show_names = commas_quote o map fst;
-
-    val illegal_vars =
-      if null (term_vars set) andalso null (term_tvars set) then []
-      else ["Illegal schematic variable(s) on rhs"];
-
-    val dup_lhs_tfrees =
-      (case duplicates lhs_tfrees of [] => []
-      | dups => ["Duplicate type variables on lhs: " ^ show_names dups]);
-
-    val extra_rhs_tfrees =
-      (case gen_rems (op =) (rhs_tfrees, lhs_tfrees) of [] => []
-      | extras => ["Extra type variables on rhs: " ^ show_names extras]);
-
-    val illegal_frees =
-      (case term_frees set of [] => []
-      | xs => ["Illegal variables on rhs: " ^ show_names (map dest_Free xs)]);
-
-    val errs = illegal_vars @ dup_lhs_tfrees @ extra_rhs_tfrees @ illegal_frees;
-  in
-    if null errs then ()
-    else error (cat_lines errs);
-
-    prove_nonempty cset (map (get_axiom thy) axms @ thms) usr_tac;
-
-    thy
-    |> add_types [(t, tlen, mx)]
-    |> add_arities
-     [(tname, replicate tlen logicS, logicS),
-      (tname, replicate tlen termS, termS)]
-    |> add_consts_i
-     [(name, setT, NoSyn),
-      (Rep_name, newT --> oldT, NoSyn),
-      (Abs_name, oldT --> newT, NoSyn)]
-    |> add_defs_i
-     [(name ^ "_def", mk_equals (setC, set))]
-    |> add_axioms_i
-     [(Rep_name, rep_type),
-      (Rep_name ^ "_inverse", rep_type_inv),
-      (Abs_name ^ "_inverse", abs_type_inv)]
-  end
-  handle ERROR =>
-    error ("The error(s) above occurred in subtype definition " ^ quote name);
-
-
-(* external interfaces *)
-
-fun cert_term sg tm =
-  cterm_of sg tm handle TERM (msg, _) => error msg;
-
-fun read_term sg str =
-  read_cterm sg (str, termTVar);
-
-val add_subtype = ext_subtype read_term;
-val add_subtype_i = ext_subtype cert_term;
-
-
-end;
-