31 ideas
10775 | The axiom of choice now seems acceptable and obvious (if it is meaningful) [Tharp] |
10766 | Logic is either for demonstration, or for characterizing structures [Tharp] |
10767 | Elementary logic is complete, but cannot capture mathematics [Tharp] |
10769 | Second-order logic isn't provable, but will express set-theory and classic problems [Tharp] |
10762 | In sentential logic there is a simple proof that all truth functions can be reduced to 'not' and 'and' [Tharp] |
17743 | De Morgan introduced a 'universe of discourse', to replace Boole's universe of 'all things' [De Morgan, by Walicki] |
10776 | The main quantifiers extend 'and' and 'or' to infinite domains [Tharp] |
10774 | There are at least five unorthodox quantifiers that could be used [Tharp] |
10773 | The Löwenheim-Skolem property is a limitation (e.g. can't say there are uncountably many reals) [Tharp] |
10777 | Skolem mistakenly inferred that Cantor's conceptions were illusory [Tharp] |
10765 | Soundness would seem to be an essential requirement of a proof procedure [Tharp] |
10763 | Completeness and compactness together give axiomatizability [Tharp] |
10770 | If completeness fails there is no algorithm to list the valid formulas [Tharp] |
10771 | Compactness is important for major theories which have infinitely many axioms [Tharp] |
10772 | Compactness blocks infinite expansion, and admits non-standard models [Tharp] |
10764 | A complete logic has an effective enumeration of the valid formulas [Tharp] |
10768 | Effective enumeration might be proved but not specified, so it won't guarantee knowledge [Tharp] |
18648 | Freedom to live according to our own conception of the good is the ultimate value [Nozick, by Kymlicka] |
20585 | If an experience machine gives you any experience you want, should you hook up for life? [Nozick] |
18643 | A minimal state should protect, but a state forcing us to do more is unjustified [Nozick] |
18642 | Individual rights are so strong that the state and its officials must be very limited in power [Nozick] |
18644 | States can't enforce mutual aid on citizens, or interfere for their own good [Nozick] |
22661 | My Anarchy, State and Utopia neglected our formal social ties and concerns [Nozick on Nozick] |
18641 | If people hold things legitimately, just distribution is simply the result of free exchanges [Nozick, by Kymlicka] |
20521 | Can I come to own the sea, by mixing my private tomato juice with it? [Nozick] |
20539 | Property is legitimate by initial acquisition, voluntary transfer, or rectification of injustice [Nozick, by Swift] |
18645 | Nozick assumes initial holdings include property rights, but we can challenge that [Kymlicka on Nozick] |
18646 | How did the private property get started? If violence was involved, we can redistribute it [Kymlicka on Nozick] |
18647 | If property is only initially acquired by denying the rights of others, Nozick can't get started [Kymlicka on Nozick] |
21737 | Unowned things may be permanently acquired, if it doesn't worsen the position of other people [Nozick] |
21738 | Maybe land was originally collectively owned, rather than unowned? [Cohen,GA on Nozick] |