--- a/src/HOL/Tools/lin_arith.ML Tue Sep 05 20:03:52 2017 +0200
+++ b/src/HOL/Tools/lin_arith.ML Thu Sep 07 15:12:40 2017 +0200
@@ -975,6 +975,7 @@
#> add_discrete_type @{type_name nat}
#> add_lessD @{thm Suc_leI}
#> add_simps (@{thms simp_thms} @ @{thms ring_distribs} @ [@{thm if_True}, @{thm if_False},
+ @{thm minus_diff_eq},
@{thm add_0_left}, @{thm add_0_right}, @{thm order_less_irrefl},
@{thm zero_neq_one}, @{thm zero_less_one}, @{thm zero_le_one},
@{thm zero_neq_one} RS not_sym, @{thm not_one_le_zero}, @{thm not_one_less_zero}])