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Full Idea
When one world generates another then it has 'access' to the world it generated. The accessibility relation between worlds is very important in possible worlds semantics.
Gist of Idea
A world has 'access' to a world it generates, which is important in possible worlds semantics
Source
Rod Girle (Modal Logics and Philosophy [2000], 3.2)
Book Ref
Girle,Rod: 'Modal Logics and Philosophy' [Acumen 2000], p.29
A Reaction
This invites the obvious question what is meant by 'generates'.