11 ideas
10882 | Predicative definitions only refer to entities outside the defined collection [Horsten] |
21566 | 'Propositional functions' are ambiguous until the variable is given a value [Russell] |
10884 | A theory is 'categorical' if it has just one model up to isomorphism [Horsten] |
21567 | 'All judgements made by Epimenedes are true' needs the judgements to be of the same type [Russell] |
10885 | Computer proofs don't provide explanations [Horsten] |
10881 | The concept of 'ordinal number' is set-theoretic, not arithmetical [Horsten] |
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] |
1748 | Archelaus was the first person to say that the universe is boundless [Archelaus, by Diog. Laertius] |
5989 | Archelaus said life began in a primeval slime [Archelaus, by Schofield] |