COMMENT ā VALID 00002 PAGES C REC PAGE DESCRIPTION C00001 00001 C00002 00002 1. result formalism, C00003 ENDMK Cā; 1. result formalism, programs and realizable programs 2. modal logic, hughes and cresswell, m s4, s5 translation to predicate calculus kripke semantics, other modals - future, dynamic logic, knowledge and belief properties of future, past, F G P H references