Modal Logic And Closure Algebras
Jon Michael Dunn, Gary M. Hardegree · 2001
Abstract The reader who has no previous familiarity with modal logic may wish to consult Hughes and Cresswell (1968, 1996). The classic, but now dated reference, is Lewis and Langford (1932). The modal logics which we shall consider are only a few among many. The reader wanting to know more about the many should consult Chellas (1980), Segerberg (1971) or Gabbay (1976). Incidentally, this section is very much influenced by Lemmon (1966) and Lemmon with Scott (1977).