Mon, 29 Sep 1997 11:40:03 +0200 paulson result() -> qed
Mon, 29 Sep 1997 11:37:02 +0200 paulson Step_tac -> Safe_tac
Mon, 29 Sep 1997 11:36:44 +0200 paulson Tidied proof of r_comp_rtrancl_eq
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