This paper is concerned with a very basic question: "What should we inter from a nonmonotonic knowlegde base?".
We present three principles which we judge essential to correctly answer this question. The second principle execeptions first is the most important one. It sheds some light upon a very obscure issue in nonmonotonic reassoning: the rising of multiple extensions. It plays a very important role on the formalization of the frame problem. It implies that abnormalities for the frame axiom are calculated step by step instead of globally as all seminal nonmonotonic formalism do.
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