18 ideas
22462 | We should speak the truth, but also preserve and pursue it [Foot] |
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] |
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] |
6017 | Nomos is king [Pindar] |
22460 | Why might we think that a state of affairs can be morally good or bad? [Foot] |
22458 | Consequentialists can hurt the innocent in order to prevent further wickedness [Foot] |
22461 | Good outcomes are not external guides to morality, but a part of virtuous actions [Foot] |
22464 | The idea of a good state of affairs has no role in the thought of Aristotle, Rawls or Scanlon [Foot] |
22463 | Morality is seen as tacit legislation by the community [Foot] |
22459 | For consequentialism, it is irrational to follow a rule which in this instance ends badly [Foot] |