Wed, 10 Jun 2015 14:46:31 +0200 wenzelm support for "if prems" in local goal statements;
Wed, 10 Jun 2015 11:52:54 +0200 wenzelm tuned message;
Wed, 10 Jun 2015 11:14:46 +0200 wenzelm tuned proofs;
Wed, 10 Jun 2015 11:14:04 +0200 wenzelm no need for protected goal (see 240ad53041c9);
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