# HG changeset patch
# User paulson
# Date 910960943 -3600
# Node ID 87595fc9508918dc79347061f6ab2078bb044b0d
# Parent  beddc19c107a935904e75715d2d22981ab984e89
not needed in distribution

diff -r beddc19c107a -r 87595fc95089 src/HOL/ex/unsolved.ML
--- a/src/HOL/ex/unsolved.ML	Fri Nov 13 13:41:53 1998 +0100
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,54 +0,0 @@
-(*  Title:      HOL/ex/unsolved
-    ID:         $Id$
-    Author:     Lawrence C Paulson, Cambridge University Computer Laboratory
-    Copyright   1992  University of Cambridge
-
-Problems that currently defeat the MESON procedure as well as best_tac
-*)
-
-(*from Vladimir Lifschitz, What Is the Inverse Method?, JAR 5  1989.  1--23*)
-        (*27 clauses; 81 Horn clauses*)
-goal HOL.thy "? x x'. ! y. ? z z'. (~P y y | P x x | ~S z x) & \
-\                                  (S x y | ~S y z | Q z' z')  & \
-\                                  (Q x' y | ~Q y z' | S x' x')";
-
-
-
-writeln"Problem 55";
-
-(*Original, equational version by Len Schubert [via Pelletier] *)
-goal HOL.thy
-  "(? x. lives x & killed x agatha) & \
-\  lives agatha & lives butler & lives charles & \
-\  (! x. lives x --> x=agatha | x=butler | x=charles) & \
-\  (! x y. killed x y --> hates x y) & \
-\  (! x y. killed x y --> ~richer x y) & \
-\  (! x. hates agatha x --> ~hates charles x) & \
-\  (! x. ~ x=butler --> hates agatha x) & \
-\  (! x. ~richer x agatha --> hates butler x) & \
-\  (! x. hates agatha x --> hates butler x) & \
-\  (! x. ? y. ~hates x y) & \
-\  ~ agatha=butler --> \
-\  killed agatha agatha";
-
-(*Halting problem: Formulation of Li Dafa (AAR Newsletter 27, Oct 1994.)
-        author U. Egly;  46 clauses; 264 Horn clauses*)
-goal HOL.thy
- "((EX X. (a X) & (ALL Y. (c Y) --> (ALL Z. (d X Y Z)))) -->  \
-\  (EX W. (c W) & (ALL Y. (c Y) --> (ALL Z. (d W Y Z)))))     \
-\ &                                                          \
-\ (ALL W. (c W) & (ALL U. (c U) --> (ALL V. (d W U V))) -->       \
-\       (ALL Y Z.                                               \
-\           ((c Y) & (h2 Y Z) --> (h3 W Y Z) & (oo W g)) &       \
-\           ((c Y) & ~(h2 Y Z) --> (h3 W Y Z) & (oo W b))))  \
-\ &                    \
-\ (ALL W. (c W) &       \
-\   (ALL Y Z.          \
-\       ((c Y) & (h2 Y Z) --> (h3 W Y Z) & (oo W g)) &       \
-\       ((c Y) & ~(h2 Y Z) --> (h3 W Y Z) & (oo W b))) -->       \
-\   (EX V. (c V) &       \
-\         (ALL Y. (((c Y) & (h3 W Y Y)) & (oo W g) --> ~(h2 V Y)) &       \
-\                 (((c Y) & (h3 W Y Y)) & (oo W b) --> (h2 V Y) & (oo V b))))) \
-\  -->                  \
-\  ~ (EX X. (a X) & (ALL Y. (c Y) --> (ALL Z. (d X Y Z))))";
-