3 ideas
13120 | Chisholm divides things into contingent and necessary, and then individuals, states and non-states [Chisholm, by Westerhoff] |
7803 | Modal logic began with translation difficulties for 'If...then' [Lewis,CI, by Girle] |
9425 | Lewis later proposed the axioms at the intersection of the best theories (which may be few) [Mumford on Lewis] |