A Modal Logic of Place
Few, if any, of the off-shoots of traditional modal logic have been as fertile both from a formal logical and from a philosophical point of view as the discipline which Prior named tense-logic, but for which the name temporal logic, suggested by Rescher, seems to me better. After I had become interested in this logic and done some work in it myself, I soon began to be intrigued by the question of whether there might not exist a ‘parallel’ branch of modal logic concerned with spatial concepts.
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