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  1. Epistemologische betrachtungen zu [S4, S5].Wolfgang Lenzen - 1979 - Erkenntnis 14 (1):33-56.
    The numerous modal systems between S4 and S5 are investigated from an epistemological point of view by interpreting necessity either as knowledge or as (strong) belief. It is shown that-granted some assumptions about epistemic logic for which the author has argued elsewhere-the system S4.4 may be interpreted as the logic of true belief, while S4.3.2 and S4.2 may be taken to represent epistemic logic systems for individuals who accept the scheme knowledge = true belief only for certain special instances. There (...)
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  • Disjunctive Extensions of S4 and a Conjecture of Goldblatt's.George F. Schumm - 1975 - Mathematical Logic Quarterly 21 (1):81-86.
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