On Oct 9, 2009, at 11:12 AM, John F. Sowa wrote:
> XSB is a freely available logic-programming system that uses
> classical negation. (01)
IIRC, XSB is based on so-called well-founded semantics for logic
programming languages (WFS), which does not in general guarantee that
a consistent set of sentences has a model in which every sentence
receives a truth value; i.e., negation isn't guaranteed to be
classical. I don't think this affects the point your were making. (02)
-chris (03)
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