12 ideas
| 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] |
| 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] |
| 21686 | Sense-data are dubious abstractions, with none of the plausibility of tables [Quine] |
| 21685 | Empiricism says evidence rests on the senses, but that insight is derived from science [Quine] |
| 22258 | Passion for progress is always short-lived [Sandel] |
| 22259 | Conservatives are either individualistic, or communal [Sandel] |
| 22260 | Modern liberalism fails to articulate a vision of the common good [Sandel] |