Schumm, George F. Interpolation in S5 and some related systems. (English) Zbl 0361.02030 Rep. Math. Logic 6, 107-109 (1976). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Cited in 6 Documents MSC: 03B45 Modal logic (including the logic of norms) PDFBibTeX XMLCite \textit{G. F. Schumm}, Rep. Math. Logic 6, 107--109 (1976; Zbl 0361.02030)