25 ideas
8092 | Logic was merely a branch of rhetoric until the scientific 17th century [Devlin] |
22234 | Post-structuralism focused on exterior determinants of thought, rather than the thinker [Oksala] |
3035 | Dialectic involves conversations with short questions and brief answers [Diog. Laertius] |
8081 | 'No councillors are bankers' and 'All bankers are athletes' implies 'Some athletes are not councillors' [Devlin] |
8085 | Modern propositional inference replaces Aristotle's 19 syllogisms with modus ponens [Devlin] |
8086 | Predicate logic retains the axioms of propositional logic [Devlin] |
8091 | Situation theory is logic that takes account of context [Devlin] |
8089 | Montague's intensional logic incorporated the notion of meaning [Devlin] |
8087 | Golden ages: 1900-1960 for pure logic, and 1950-1985 for applied logic [Devlin] |
8082 | Where a conditional is purely formal, an implication implies a link between premise and conclusion [Devlin] |
8072 | Sentences of apparent identical form can have different contextual meanings [Devlin] |
8075 | Space and time are atomic in the arrow, and divisible in the tortoise [Devlin] |
1816 | Sceptics say demonstration depends on self-demonstrating things, or indemonstrable things [Diog. Laertius] |
1819 | Scepticism has two dogmas: that nothing is definable, and every argument has an opposite argument [Diog. Laertius] |
3064 | When sceptics say that nothing is definable, or all arguments have an opposite, they are being dogmatic [Diog. Laertius] |
8088 | People still say the Hopi have no time concepts, despite Whorf's later denial [Devlin] |
3033 | Induction moves from some truths to similar ones, by contraries or consequents [Diog. Laertius] |
8073 | How do we parse 'time flies like an arrow' and 'fruit flies like an apple'? [Devlin] |
8076 | The distinction between sentences and abstract propositions is crucial in logic [Devlin] |
1838 | Cyrenaic pleasure is a motion, but Epicurean pleasure is a condition [Diog. Laertius] |
1769 | Cynics believe that when a man wishes for nothing he is like the gods [Diog. Laertius] |
20582 | World government needs a shared global identity [Oksala] |
20568 | The principles Rawls arrives at do not just conform to benevolence, but also result from choices [Oksala] |
20578 | Anarchists prefer local and communal government [Oksala] |
20574 | Utilitarianism neglects responsibility, duties and rights [Oksala] |