15 ideas
| 6259 | Why can't a wise man doubt everything? [Montaigne] |
| 6263 | No wisdom could make us comfortably walk a wide beam if it was high in the air [Montaigne] |
| 6258 | Virtue is the distinctive mark of truth, and its greatest product [Montaigne] |
| 13206 | A 'linear or total ordering' must be transitive and satisfy trichotomy [Enderton] |
| 13201 | ∈ says the whole set is in the other; ⊆ says the members of the subset are in the other [Enderton] |
| 13204 | The 'ordered pair' <x,y> is defined to be {{x}, {x,y}} [Enderton] |
| 13200 | Note that {Φ} =/= Φ, because Φ ∈ {Φ} but Φ ∉ Φ [Enderton] |
| 13199 | The empty set may look pointless, but many sets can be constructed from it [Enderton] |
| 13203 | The singleton is defined using the pairing axiom (as {x,x}) [Enderton] |
| 13202 | Fraenkel added Replacement, to give a theory of ordinal numbers [Enderton] |
| 13205 | We can only define functions if Choice tells us which items are involved [Enderton] |
| 6262 | We lack some sense or other, and hence objects may have hidden features [Montaigne] |
| 6260 | Sceptics say there is truth, but no means of making or testing lasting judgements [Montaigne] |
| 6261 | The soul is in the brain, as shown by head injuries [Montaigne] |
| 468 | Musical performance can reveal a range of virtues [Damon of Ath.] |