Thu, 06 Aug 1998 15:48:13 +0200 paulson even more tidying of Goal commands
Thu, 06 Aug 1998 15:47:26 +0200 paulson A higher-level treatment of LeadsTo, minimizing use of "reachable"
Thu, 06 Aug 1998 14:04:49 +0200 nipkow Simplified proof!!
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