modal proposition

On Conjunctive or Disjunctive Proposition of Modality and Modal Proposition of Conjunctive Form or Disjunctive Form

模态联言、选言命题与联言、选言模态命题

On the Modal Implication of Conditional Proposition & and That Any Logical Truth Can Not Hold on Absolutely without Considering Any Empirical Fact

论蕴涵命题的模态意义&兼论逻辑真理不能完全独立于经验事实之外