Normal bimodal logics of ability and action |
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Authors: | Mark A. Brown |
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Affiliation: | (1) Philosophy Department, Syracuse University, 13244 Syracuse, NY, USA |
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Abstract: | The basic bimodal systemK/K can be interpreted as an analysis of the logic of ability developed in [1]. Where in [1] we would express the claimI can bring it about that P using the formula, with its non-normal operator, we will now use the formula. Here is a normal alethic possibilitation operator.is a normal necessitation operator, but it is independent of, and not subject to an alethic interpretation. Rather, is interpreted to meanI bring it about that P. The result is a simplification and clarification of a combined logic of ability and action like that in [2], but employing only normal operators.A number of extensions of the basic systemK/K are constructed, first by strengthening the two normal sublogics independently and then by linking the two sublogics via axiom schemata involving both operators. The result is a series of increasingly strong systems which more and more adequately fulfill our expectations for a satisfactory logic of action and ability.I am grateful to Valentin Goranko, David K. Lewis, Marion Sarkis Mircheva, and Solomon Passy for helpful discussions and correspondence on these topics. |
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