An epistemic logic based on change and the paradox of unknowability
Unknowable paradox threatens any theory that entails the principle of knowability.In this paper,I argue that the propositional attitude knowing is a a state that is undergoing change when we know something that was unknown before.And the unknowable paradox is in fact a denial of this change by contradictions.There are consistent and inconsistent theories for modeling change.In a view of physicalism,we propose to relate this propositional attitude to the present time of possible worlds based on the fact that the tense of its definition in order to avoid a inconsistent theory of change.It shows that theorem 5 of Fitch turns out to be that if there is an unknown truth now then it is unknown now that it is unknown truth now.It is compatible with the principle of knowability because speaking specially,it is still possible that it is known in a future time that it is an unknown now.
Paradox of knowability Modal logic epistemic logic
Lei Liu
Department of Computer Science Tongji University Shanghai,China Department of Computer Science and Technology Dezhou University Dezhou,China
国际会议
秦皇岛
英文
301-304
2010-11-05（万方平台首次上网日期，不代表论文的发表时间）