The number of nonnormal extensions of ${\rm S4}$

Notre Dame Journal of Formal Logic 29 (1):106-108 (1987)
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1988

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10.1305/ndjfl/1093637775

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The number of nonnormal extensions of S4.George F. Schumm - 1987 - Notre Dame Journal of Formal Logic 29:106-108.
Bolesław Sobociński. Certain extensions of modal system S4. Notre Dame journal of formal logic, vol. 11 no. 3 , pp. 347–368. - Bolesław Sobociński. Concerning some extensions of S4. Notre Dame journal of formal logic, vol. 12 , pp. 363–370. - G. F. Schumm. Solutions to four modal problems of Sobocinski. Notre Dame journal of formal logic, vol. 12 , pp. 335–340. - J. Jay Zeman. A study of some systems in the neighborhood of S4.4. Notre Dame journal of formal logic, vol. 12 , pp. 341–357. - Bolesław Sobociński. A new class of modal systems. Notre Dame journal of formal logic, vol. 12 , pp. 371–377. - Bolesław Sobociński. A proper subsystem of S4.04. Notre Dame journal of formal logic, vol. 12 , pp. 381–384. [REVIEW]M. J. Cresswell - 1975 - Journal of Symbolic Logic 40 (4):602.
Additional extensions of S4.G. N. Georgacarakos - 1977 - Notre Dame Journal of Formal Logic 18:477.
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Certain extensions of modal system $S4$.Bolesław Sobociński - 1970 - Notre Dame Journal of Formal Logic 11 (3):347-368.
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A reduction in the number of independent axiom schemata for $S4$.Leo Simons - 1962 - Notre Dame Journal of Formal Logic 3 (4):256-258.
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S4:1:4 = s4:1:2 and s4:021 = s4:04.Wolfgang Lenzen - 1978 - Notre Dame Journal of Formal Logic 19 (July):465-466.
E and S4.Robert K. Meyer - 1970 - Notre Dame Journal of Formal Logic 11 (2):181-199.

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