In modal logic, an accessibility relation is a binary relation, written as between possible worlds.
Read more about Accessibility Relation: Description of Terms, Basic Review of (Propositional) Modal Logic, The Four Types of The 'Accessibility Relation' in Formal Semantics, Comment About The 'Accessibility Relation', Philosophical Applications, Computer Science Applications
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“Our sympathy is cold to the relation of distant misery.”
—Edward Gibbon (1737–1794)