18 ideas
8797 | The negation of all my beliefs about my current headache would be fully coherent [Sosa] |
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] |
16641 | Whiteness does not exist, but by it something can exist-as-white [Aquinas] |
22170 | Senses grasp external properties, but the understanding grasps the essential natures of things [Aquinas] |
22169 | Initial universal truths are present within us as potential, to be drawn out by reason [Aquinas] |
22168 | Minds take in a likeness of things, which activates an awaiting potential [Aquinas] |
8794 | There are very few really obvious truths, and not much can be proved from them [Sosa] |
8796 | A single belief can trail two regresses, one terminating and one not [Sosa] |
8799 | If mental states are not propositional, they are logically dumb, and cannot be foundations [Sosa] |
8795 | Mental states cannot be foundational if they are not immune to error [Sosa] |
8798 | Vision causes and justifies beliefs; but to some extent the cause is the justification [Sosa] |