Sun, 09 Apr 2017 20:44:35 +0200 clarified main ZF.thy / ZFC.thy, and avoid name clash with global HOL/Main.thy;
wenzelm [Sun, 09 Apr 2017 20:44:35 +0200] rev 65449
clarified main ZF.thy / ZFC.thy, and avoid name clash with global HOL/Main.thy;
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