Thu, 02 Mar 2000 18:18:10 +0100 wenzelm added freeze_all;
Thu, 02 Mar 2000 10:29:29 +0100 paulson polished version of the Allocator using Rename
Thu, 02 Mar 2000 10:26:22 +0100 paulson tidied the proofs of singleton_insert_inj_eq, singleton_insert_inj_eq' and
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