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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“Science is the language of the temporal world; love is that of the spiritual world. Man, indeed, describes more than he explains; while the angelic spirit sees and understands. Science saddens man; love enraptures the angel; science is still seeking, love has found. Man judges of nature in relation to itself; the angelic spirit judges of it in relation to heaven. In short to the spirits everything speaks.”
—Honoré De Balzac (1799–1850)