12 ideas
14970 | Normal system K has five axioms and rules [Cresswell] |
14971 | D is valid on every serial frame, but not where there are dead ends [Cresswell] |
14972 | S4 has 14 modalities, and always reduces to a maximum of three modal operators [Cresswell] |
14973 | In S5 all the long complex modalities reduce to just three, and their negations [Cresswell] |
14976 | Reject the Barcan if quantifiers are confined to worlds, and different things exist in other worlds [Cresswell] |
16664 | Everything that exists is either a substance or an accident [Albert of Saxony] |
14974 | A relation is 'Euclidean' if aRb and aRc imply bRc [Cresswell] |
16703 | God could make a successive thing so that previous parts cease to exist [Albert of Saxony] |
16699 | Successive entities just need parts to succeed one another, without their existence [Albert of Saxony] |
14975 | A de dicto necessity is true in all worlds, but not necessarily of the same thing in each world [Cresswell] |
16570 | Elements are found last in dismantling bodies, and first in generating them [Albert of Saxony] |
1513 | The Egyptians were the first to say the soul is immortal and reincarnated [Herodotus] |