The transience of possibility

Abstract
The standard view of metaphysical necessity is that it is truth in all possible worlds, and therefore that the correct modal logic for metaphysical necessity is S5, in models of which all worlds are accessible from each other. I argue that S5 cannot be the correct logic for metaphysical necessity because accessibility is not symmetric: there are possible worlds that are accessible from ours but from which our world is not accessible. There are (or could be) some individuals who, if they had not existed, could not have existed. Once the possibility of such individuals is lost, it is gone forever.
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    Reina Hayaki (2009). Fictions Within Fictions. Philosophical Studies 146 (3):379 - 398.
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