src/HOL/ex/Puzzle.ML
changeset 2609 4370e5f0fa3f
parent 2031 03a843f0f447
child 3336 29ddef80bd49
     1.1 --- a/src/HOL/ex/Puzzle.ML	Wed Feb 12 18:53:59 1997 +0100
     1.2 +++ b/src/HOL/ex/Puzzle.ML	Wed Feb 12 18:54:39 1997 +0100
     1.3 @@ -23,7 +23,7 @@
     1.4  by (subgoal_tac "f(na) <= f(f(na))" 1);
     1.5  by (fast_tac (!claset addIs [Puzzle.f_ax]) 2);
     1.6  by (rtac lessD 1);
     1.7 -by (best_tac (!claset delrules [le_refl] 
     1.8 +by (fast_tac (!claset delrules [order_refl] 
     1.9                        addIs [Puzzle.f_ax, le_less_trans]) 1);
    1.10  val lemma = result() RS spec RS mp;
    1.11