14 ideas
| 7719 | European philosophy consists of a series of footnotes to Plato [Whitehead] |
| 14249 | Boolos reinterprets second-order logic as plural logic [Boolos, by Oliver/Smiley] |
| 10830 | Second-order logic metatheory is set-theoretic, and second-order validity has set-theoretic problems [Boolos] |
| 10829 | A sentence can't be a truth of logic if it asserts the existence of certain sets [Boolos] |
| 10656 | With 'extensive connection', boundary elements are not included in domains [Whitehead, by Varzi] |
| 10832 | '∀x x=x' only means 'everything is identical to itself' if the range of 'everything' is fixed [Boolos] |
| 10834 | Weak completeness: if it is valid, it is provable. Strong: it is provable from a set of sentences [Boolos] |
| 13841 | Why should compactness be definitive of logic? [Boolos, by Hacking] |
| 10833 | Many concepts can only be expressed by second-order logic [Boolos] |
| 15389 | In Whitehead 'processes' consist of events beginning and ending [Whitehead, by Simons] |
| 13304 | Learned men gain more in one day than others do in a lifetime [Posidonius] |
| 15247 | Whitehead held that perception was a necessary feature of all causation [Whitehead, by Harré/Madden] |
| 16962 | Whitehead replaced points with extended regions [Whitehead, by Quine] |
| 20820 | Time is an interval of motion, or the measure of speed [Posidonius, by Stobaeus] |