7 ideas
| 9565 | Zermelo made 'set' and 'member' undefined axioms [Zermelo, by Chihara] |
| 3339 | For Zermelo's set theory the empty set is zero and the successor of each number is its unit set [Zermelo, by Blackburn] |
| 8209 | Part of the folk concept of qualia is what makes recognition and comparison possible [Lewis] |
| 4581 | Virtues and vices are like secondary qualities in perception, found in observers, not objects [Hume] |
| 4580 | All virtues benefit either the public, or the individual who possesses them [Hume] |
| 4579 | The idea of a final cause is very uncertain and unphilosophical [Hume] |
| 20705 | That events could be uncaused is absurd; I only say intuition and demonstration don't show this [Hume] |