Mon, 22 Mar 2010 00:48:56 +0100 wenzelm replaced PureThy.add_axioms by more basic Drule.add_axiom, which is old-style nonetheless;
Sun, 21 Mar 2010 22:24:04 +0100 wenzelm add_axiom: axiomatize "unconstrained" version, with explicit of_class premises;
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