Sun, 20 May 2018 22:37:00 +0200 wenzelm more checks for global facts: disallow undeclared frees (as in Export_Theory.export_fact);
Mon, 21 May 2018 18:36:30 +0200 nipkow no longer necessary
Sun, 20 May 2018 22:10:30 +0100 paulson merged
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