Computer Science Applications
In modeling a computation, a 'possible world' can be a possible computer state. Given the current computer state, you might define the accessible possible worlds to be all future possible computer states, or to be all possible immediate "next" computer states (assuming a discrete computer). Either choice defines a particular 'accessibility relation' giving rise to a particular modal logic suited specifically for theorems about the computation.
Read more about this topic: Accessibility Relation
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