15 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] |
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] |
13851 | Unlike most other signs, = cannot be eliminated [Engelbretsen/Sayward] |
13852 | Axioms are ω-incomplete if the instances are all derivable, but the universal quantification isn't [Engelbretsen/Sayward] |
3016 | Even the gods cannot strive against necessity [Pittacus, by Diog. Laertius] |
20475 | Maybe modal sentences cannot be true or false [Casullo] |
20476 | If the necessary is a priori, so is the contingent, because the same evidence is involved [Casullo] |
20471 | Epistemic a priori conditions concern either the source, defeasibility or strength [Casullo] |
20477 | The main claim of defenders of the a priori is that some justifications are non-experiential [Casullo] |
20472 | Analysis of the a priori by necessity or analyticity addresses the proposition, not the justification [Casullo] |
20474 | 'Overriding' defeaters rule it out, and 'undermining' defeaters weaken in [Casullo] |