Tue, 10 Jun 2008 19:15:23 +0200 wenzelm nat_induct_tac (works without context);
Tue, 10 Jun 2008 19:15:23 +0200 wenzelm moved case_tac/induct_tac to induct_tacs.ML -- no longer hardwired into datatype package;
Tue, 10 Jun 2008 19:15:21 +0200 wenzelm added nat_induct_tac (works without context);
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