2005-09-15 実質含意 哲学 メモ wikipedia:en:Material implication wikipedia:en:Strict implication http://www.earlham.edu/~peters/courses/log/mat-imp.htm http://idiocentrism.com/phil.implicate.htm http://plato.stanford.edu/entries/conditionals/ Relevant Logic: wikipedia:en:Relevant logic http://plato.stanford.edu/entries/logic-relevance/ wikipedia:適切さの論理 関連: wikipedia:en:Vacuous truth