15 ideas
14779 | I reason in order to avoid disappointment and surprise [Peirce] |
14777 | That a judgement is true and that we judge it true are quite different things [Peirce] |
17884 | Mathematical set theory has many plausible stopping points, such as finitism, and predicativism [Koellner] |
17893 | 'Reflection principles' say the whole truth about sets can't be captured [Koellner] |
14780 | Only study logic if you think your own reasoning is deficient [Peirce] |
21566 | 'Propositional functions' are ambiguous until the variable is given a value [Russell] |
17894 | We have no argument to show a statement is absolutely undecidable [Koellner] |
21567 | 'All judgements made by Epimenedes are true' needs the judgements to be of the same type [Russell] |
17890 | There are at least eleven types of large cardinal, of increasing logical strength [Koellner] |
17887 | PA is consistent as far as we can accept, and we expand axioms to overcome limitations [Koellner] |
17891 | Arithmetical undecidability is always settled at the next stage up [Koellner] |
23457 | Type theory cannot identify features across levels (because such predicates break the rules) [Morris,M on Russell] |
21556 | Classes are defined by propositional functions, and functions are typed, with an axiom of reducibility [Russell, by Lackey] |
21568 | A one-variable function is only 'predicative' if it is one order above its arguments [Russell] |
14778 | Facts are hard unmoved things, unaffected by what people may think of them [Peirce] |