28 ideas
8092 | Logic was merely a branch of rhetoric until the scientific 17th century [Devlin] |
18996 | A statement S is 'partly true' if it has some wholly true parts [Yablo] |
19006 | An 'enthymeme' is an argument with an indispensable unstated assumption [Yablo] |
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] |
18999 | y is only a proper part of x if there is a z which 'makes up the difference' between them [Yablo] |
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] |
8072 | Sentences of apparent identical form can have different contextual meanings [Devlin] |
19001 | 'Pegasus doesn't exist' is false without Pegasus, yet the absence of Pegasus is its truthmaker [Yablo] |
8075 | Space and time are atomic in the arrow, and divisible in the tortoise [Devlin] |
19002 | A nominalist can assert statements about mathematical objects, as being partly true [Yablo] |
18998 | Parthood lacks the restriction of kind which most relations have [Yablo] |
19004 | Gettier says you don't know if you are confused about how it is true [Yablo] |
8088 | People still say the Hopi have no time concepts, despite Whorf's later denial [Devlin] |
19007 | A theory need not be true to be good; it should just be true about its physical aspects [Yablo] |
18993 | If sentences point to different evidence, they must have different subject-matter [Yablo] |
19003 | Most people say nonblack nonravens do confirm 'all ravens are black', but only a tiny bit [Yablo] |
6172 | The Inverted Earth example shows that phenomenal properties are not representational [Block, by Rowlands] |
18992 | Sentence-meaning is the truth-conditions - plus factors responsible for them [Yablo] |
8073 | How do we parse 'time flies like an arrow' and 'fruit flies like an apple'? [Devlin] |
18994 | The content of an assertion can be quite different from compositional content [Yablo] |
18997 | Truth-conditions as subject-matter has problems of relevance, short cut, and reversal [Yablo] |
8076 | The distinction between sentences and abstract propositions is crucial in logic [Devlin] |
19005 | Not-A is too strong to just erase an improper assertion, because it actually reverses A [Yablo] |