18 ideas
10751 | Second-order logic needs the sets, and its consequence has epistemological problems [Rossberg] |
10757 | Henkin semantics has a second domain of predicates and relations (in upper case) [Rossberg] |
10759 | There are at least seven possible systems of semantics for second-order logic [Rossberg] |
10753 | Logical consequence is intuitively semantic, and captured by model theory [Rossberg] |
10752 | Γ |- S says S can be deduced from Γ; Γ |= S says a good model for Γ makes S true [Rossberg] |
11970 | Logicians like their entities to exhibit a maximum degree of purity [Kaplan] |
10754 | In proof-theory, logical form is shown by the logical constants [Rossberg] |
10756 | A model is a domain, and an interpretation assigning objects, predicates, relations etc. [Rossberg] |
10758 | If models of a mathematical theory are all isomorphic, it is 'categorical', with essentially one model [Rossberg] |
10761 | Completeness can always be achieved by cunning model-design [Rossberg] |
10755 | A deductive system is only incomplete with respect to a formal semantics [Rossberg] |
11969 | Models nicely separate particulars from their clothing, and logicians often accept that metaphysically [Kaplan] |
11971 | The simplest solution to transworld identification is to adopt bare particulars [Kaplan] |
11973 | Unusual people may have no counterparts, or several [Kaplan] |
11972 | Essence is a transworld heir line, rather than a collection of properties [Kaplan] |
8824 | No one has defended translational phenomenalism since Ayer in 1940 [Ayer, by Kim] |
11967 | Sentences might have the same sense when logically equivalent - or never have the same sense [Kaplan] |
15251 | The attribution of necessity to causation is either primitive animism, or confusion with logical necessity [Ayer] |