Tue, 15 Apr 2008 18:49:23 +0200 wenzelm removed obsolete SIGN_THEORY -- no name aliases in structure Theory;
Tue, 15 Apr 2008 18:49:22 +0200 wenzelm removed obsolete SIGN_THEORY -- no name aliases in structure Theory;
Tue, 15 Apr 2008 18:49:21 +0200 wenzelm added intern_fact, check_fact, hide_fact;
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