Wed, 24 Aug 2011 16:08:21 -0700 add lemma closure_union;
huffman [Wed, 24 Aug 2011 16:08:21 -0700] rev 44518
add lemma closure_union; simplify some proofs;
Wed, 24 Aug 2011 15:32:40 -0700 minimize imports
huffman [Wed, 24 Aug 2011 15:32:40 -0700] rev 44517
minimize imports
Wed, 24 Aug 2011 15:06:13 -0700 move everything related to 'norm' method into new theory file Norm_Arith.thy
huffman [Wed, 24 Aug 2011 15:06:13 -0700] rev 44516
move everything related to 'norm' method into new theory file Norm_Arith.thy
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