Tue, 22 May 2018 11:05:47 +0200 wenzelm merged
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
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