共 5 条
- [1] Bull R.A., 1965, NOTRE DAME J FORM L, V6, P142, DOI DOI 10.1305/NDJFL/1093958154
- [2] CROSSLEY JN, 1965, FORMAL SYSTEMS RE ED
- [3] Fitch F. B., 1948, PORT MATH, V7, P113
- [4] Kripke Saul, 1959, J SYMBOLIC LOGIC, V24, P1, DOI DOI 10.2307/2964568
- [5] Kripke Saul A., 1965, FORMAL SYSTEMS RECUR, P92