22 ideas
13913 | The four 'perfect syllogisms' are called Barbara, Celarent, Darii and Ferio [Engelbretsen/Sayward] |
13914 | Syllogistic logic has one rule: what is affirmed/denied of wholes is affirmed/denied of their parts [Engelbretsen/Sayward] |
13915 | Syllogistic can't handle sentences with singular terms, or relational terms, or compound sentences [Engelbretsen/Sayward] |
13916 | Term logic uses expression letters and brackets, and '-' for negative terms, and '+' for compound terms [Engelbretsen/Sayward] |
17750 | The first clear proof of the consistency of the first order predicate logic was in 1928 [Hilbert/Ackermann, by Walicki] |
13850 | In modern logic all formal validity can be characterised syntactically [Engelbretsen/Sayward] |
13849 | Classical logic rests on truth and models, where constructivist logic rests on defence and refutation [Engelbretsen/Sayward] |
11970 | Logicians like their entities to exhibit a maximum degree of purity [Kaplan] |
13851 | Unlike most other signs, = cannot be eliminated [Engelbretsen/Sayward] |
11989 | For Russell, expressions dependent on contingent circumstances must be eliminated [Kaplan] |
13852 | Axioms are ω-incomplete if the instances are all derivable, but the universal quantification isn't [Engelbretsen/Sayward] |
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] |
11972 | Essence is a transworld heir line, rather than a collection of properties [Kaplan] |
11973 | Unusual people may have no counterparts, or several [Kaplan] |
11990 | 'Haecceitism' says that sameness or difference of individuals is independent of appearances [Kaplan] |
9668 | 'Haecceitism' is common thisness under dissimilarity, or distinct thisnesses under resemblance [Kaplan] |
11991 | If quantification into modal contexts is legitimate, that seems to imply some form of haecceitism [Kaplan] |
11967 | Sentences might have the same sense when logically equivalent - or never have the same sense [Kaplan] |
14080 | Are causal descriptions part of the causal theory of reference, or are they just metasemantic? [Kaplan, by Schaffer,J] |
14894 | Indexicals have a 'character' (the standing meaning), and a 'content' (truth-conditions for one context) [Kaplan, by Macià/Garcia-Carpentiro] |
14700 | 'Content' gives the standard modal profile, and 'character' gives rules for a context [Kaplan, by Schroeter] |