Mon, 02 Nov 2009 22:24:03 +0100 krauss conceal partial rules depending on config flag (i.e. when called via "fun")
Mon, 02 Nov 2009 22:24:00 +0100 krauss conceal "termination" rule, used only by special tools
Mon, 02 Nov 2009 22:23:57 +0100 krauss do not use Binding.empty: conceal flag gets lost in Thm.def_binding_optional
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