changeset 56545 | 8f1e7596deb7 |
parent 56529 | aff193f53a64 |
child 58881 | b9556a055632 |
--- a/src/HOL/Library/Mapping.thy Sat Apr 12 17:26:27 2014 +0200 +++ b/src/HOL/Library/Mapping.thy Sat Apr 12 11:27:36 2014 +0200 @@ -292,6 +292,10 @@ "\<not> is_empty (map_default k v f m)" by (simp add: map_default_def) +lemma keys_dom_lookup: + "keys m = dom (Mapping.lookup m)" + by transfer rule + lemma keys_empty [simp]: "keys empty = {}" by transfer simp