src/ZF/ROOT.ML

ex_impE was incorrectly listed as Safe

(*  Title:      ZF/ROOT
    ID:         $Id$
    Author:     Lawrence C Paulson, Cambridge University Computer Laboratory
    Copyright   1993  University of Cambridge

Adds Zermelo-Fraenkel Set Theory to a database containing First-Order Logic.

This theory is the work of Martin Coen, Philippe Noel and Lawrence Paulson.
*)

val banner = "ZF Set Theory (in FOL)";
writeln banner;

eta_contract:=false;

(*For Pure/tactic??  A crude way of adding structure to rules*)
fun CHECK_SOLVED tac st =
    case Sequence.pull (tac st) of
        None => error"DO_GOAL: tactic list failed"
      | Some(x,_) => 
                if has_fewer_prems 1 x then
                    Sequence.cons(x, Sequence.null)
                else (writeln"DO_GOAL: unsolved goals!!";
                      writeln"Final proof state was ...";
                      print_goals (!goals_limit) x;
                      raise ERROR);

fun DO_GOAL tfs = SELECT_GOAL (CHECK_SOLVED (EVERY1 tfs));

print_depth 1;

(*Add user sections for inductive/datatype definitions*)
use     "../Pure/section_utils.ML";
use     "thy_syntax.ML";

use_thy "Let";
use_thy "func";
use     "typechk.ML";
use_thy "InfDatatype";
use_thy "List";
use_thy "EquivClass";

(*printing functions are inherited from FOL*)
print_depth 8;

val ZF_build_completed = ();    (*indicate successful build*)