non-monotonic logic

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Logic that duplicates the ‘defeasible’ nature of much informal and everyday reasoning. In such reasoning, a set of premises may entitle one to draw a conclusion, yet the addition of further information force its withdrawal. From the fact that Tweety is a bird it is reasonable to infer that Tweety can fly; but if you add the premise that Tweety is a penguin then the inference is nullified.

Subjects: Philosophy.

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