Bolesław Sobociński. Certain extensions of modal system S4. Notre Dame journal of formal logic, vol. 11 no. 3 (1970), pp. 347–368. - Bolesław Sobociński. Concerning some extensions of S4. Notre Dame journal of formal logic, vol. 12 (1971), pp. 363–370. - G. F. Schumm. Solutions to four modal problems of Sobocinski. Notre Dame journal of formal logic, vol. 12 (1971), 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 (1971), pp. 341–357. - Bolesław Sobociński. A new class of modal systems. Notre Dame journal of formal logic, vol. 12 (1971), pp. 371–377. - Bolesław Sobociński. A proper subsystem of S4.04. Notre Dame journal of formal logic, vol. 12 (1971), pp. 381–384.

M. J. Cresswell

doi:10.2307/2271811

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Bolesław Sobociński. Certain extensions of modal system S4. Notre Dame journal of formal logic, vol. 11 no. 3 (1970), pp. 347–368. - Bolesław Sobociński. Concerning some extensions of S4. Notre Dame journal of formal logic, vol. 12 (1971), pp. 363–370. - G. F. Schumm. Solutions to four modal problems of Sobocinski. Notre Dame journal of formal logic, vol. 12 (1971), 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 (1971), pp. 341–357. - Bolesław Sobociński. A new class of modal systems. Notre Dame journal of formal logic, vol. 12 (1971), pp. 371–377. - Bolesław Sobociński. A proper subsystem of S4.04. Notre Dame journal of formal logic, vol. 12 (1971), pp. 381–384.

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Bolesław Sobociński. Certain extensions of modal system S4. Notre Dame journal of formal logic, vol. 11 no. 3 (1970), pp. 347–368. - Bolesław Sobociński. Concerning some extensions of S4. Notre Dame journal of formal logic, vol. 12 (1971), pp. 363–370. - G. F. Schumm. Solutions to four modal problems of Sobocinski. Notre Dame journal of formal logic, vol. 12 (1971), 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 (1971), pp. 341–357. - Bolesław Sobociński. A new class of modal systems. Notre Dame journal of formal logic, vol. 12 (1971), pp. 371–377. - Bolesław Sobociński. A proper subsystem of S4.04. Notre Dame journal of formal logic, vol. 12 (1971), pp. 381–384.

To save this article to your Google Drive account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you used this feature, you will be asked to authorise Cambridge Core to connect with your Google Drive account. Find out more about saving content to Google Drive.

Bolesław Sobociński. Certain extensions of modal system S4. Notre Dame journal of formal logic, vol. 11 no. 3 (1970), pp. 347–368. - Bolesław Sobociński. Concerning some extensions of S4. Notre Dame journal of formal logic, vol. 12 (1971), pp. 363–370. - G. F. Schumm. Solutions to four modal problems of Sobocinski. Notre Dame journal of formal logic, vol. 12 (1971), 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 (1971), pp. 341–357. - Bolesław Sobociński. A new class of modal systems. Notre Dame journal of formal logic, vol. 12 (1971), pp. 371–377. - Bolesław Sobociński. A proper subsystem of S4.04. Notre Dame journal of formal logic, vol. 12 (1971), pp. 381–384.

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