17 ideas
13838 | A decent modern definition should always imply a semantics [Hacking] |
13833 | 'Thinning' ('dilution') is the key difference between deduction (which allows it) and induction [Hacking] |
13834 | Gentzen's Cut Rule (or transitivity of deduction) is 'If A |- B and B |- C, then A |- C' [Hacking] |
13835 | Only Cut reduces complexity, so logic is constructive without it, and it can be dispensed with [Hacking] |
13845 | The various logics are abstractions made from terms like 'if...then' in English [Hacking] |
13840 | First-order logic is the strongest complete compact theory with Löwenheim-Skolem [Hacking] |
13844 | A limitation of first-order logic is that it cannot handle branching quantifiers [Hacking] |
13842 | Second-order completeness seems to need intensional entities and possible worlds [Hacking] |
13837 | With a pure notion of truth and consequence, the meanings of connectives are fixed syntactically [Hacking] |
13839 | Perhaps variables could be dispensed with, by arrows joining places in the scope of quantifiers [Hacking] |
13843 | If it is a logic, the Löwenheim-Skolem theorem holds for it [Hacking] |
9464 | One of their own prophets said that Cretans are always liars [Anon (Titus)] |
22594 | In 1794 France all individual and legal rights were suppressed by the general will [Dunt] |
22602 | Over several centuries a set of eight main liberal values was established [Dunt] |
22596 | No government, or the whole nation, can control an individual beyond legitimate scope [Dunt] |
22603 | Laissez-faire liberalism failed to give people the protections and freedoms needed for a good life [Dunt] |
22592 | Nationalism pretends that we can only have a single identity [Dunt] |