21 ideas
8092 | Logic was merely a branch of rhetoric until the scientific 17th century [Devlin] |
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] |
8087 | Golden ages: 1900-1960 for pure logic, and 1950-1985 for applied logic [Devlin] |
8089 | Montague's intensional logic incorporated the notion of meaning [Devlin] |
8082 | Where a conditional is purely formal, an implication implies a link between premise and conclusion [Devlin] |
12219 | Whether a modal claim is true depends on how the object is described [Quine, by Fine,K] |
8072 | Sentences of apparent identical form can have different contextual meanings [Devlin] |
10922 | Objects are the values of variables, so a referentially opaque context cannot be quantified into [Quine] |
8075 | Space and time are atomic in the arrow, and divisible in the tortoise [Devlin] |
10923 | Aristotelian essentialism says a thing has some necessary and some non-necessary properties [Quine] |
10921 | Necessity can attach to statement-names, to statements, and to open sentences [Quine] |
10924 | Necessity is in the way in which we say things, and not things themselves [Quine] |
8088 | People still say the Hopi have no time concepts, despite Whorf's later denial [Devlin] |
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] |
21236 | Instead of gravitational force, we now have a pervasive gravitational field [Farmelo] |
21235 | The Schrödinger waves are just the maths of transforming energy values to positions [Farmelo] |
21234 | Experiments show that fundamental particles of one type are identical [Farmelo] |