Hughes, G. D.; Cresswell, M. J. An introduction to modal logic. (English) Zbl 0205.00503 London: Methuen and Co., Ltd., New York: Barnes and Noble, Inc. XII, 388 p. (1968). Page: −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Cited in 3 ReviewsCited in 226 Documents MSC: 03B45 Modal logic (including the logic of norms) PDFBibTeX XML