13 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] |
| 4581 | Virtues and vices are like secondary qualities in perception, found in observers, not objects [Hume] |
| 4580 | All virtues benefit either the public, or the individual who possesses them [Hume] |
| 23420 | In a pluralist society we can't expect a community united around one conception of the good [Rawls] |
| 4579 | The idea of a final cause is very uncertain and unphilosophical [Hume] |
| 20705 | That events could be uncaused is absurd; I only say intuition and demonstration don't show this [Hume] |