Abstract
In this paper we present a resolution method for a non monotonic multimodal logic: Hypothesis Theory. As we define a resolution method, we need modal formula to be in clausal normal form. But an important problem with modal logic is that there is no such simple normal form than in classical logic. So we propose an original clausal transformation for modal formulas. This translation avoids the exponential increase in size which may occur with another translation. Moreover, modal formulas and their translation entails the same formulas. This technique should increase the attractiveness of modal resolution based theorem provers for automated reasoning.
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