Sat, 20 Aug 2011 23:36:18 +0200 wenzelm odd workaround for odd problem of load order in HOL/ex/ROOT.ML (!??);
Sat, 20 Aug 2011 23:35:30 +0200 wenzelm refined Graph implementation: more abstract/scalable Graph.Keys instead of plain lists -- order of adjacency is now standardized wrt. Key.ord;
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