17 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] |
15127 | A categorical basis could hardly explain a disposition if it had no powers of its own [Hawthorne] |
15123 | Is the causal profile of a property its essence? [Hawthorne] |
15122 | Could two different properties have the same causal profile? [Hawthorne] |
15124 | If properties are more than their powers, we could have two properties with the same power [Hawthorne] |
15128 | We can treat the structure/form of the world differently from the nodes/matter of the world [Hawthorne] |
15121 | An individual essence is a necessary and sufficient profile for a thing [Hawthorne] |
1748 | Archelaus was the first person to say that the universe is boundless [Archelaus, by Diog. Laertius] |
15126 | Maybe scientific causation is just generalisation about the patterns [Hawthorne] |
15125 | We only know the mathematical laws, but not much else [Hawthorne] |
5989 | Archelaus said life began in a primeval slime [Archelaus, by Schofield] |