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] |
18758 | Validity is provable, but invalidity isn't, because the model is infinite [Church, by McGee] |
20725 | The idea of duty in one's calling haunts us, like a lost religion [Weber] |
20722 | Acquisition and low consumption lead to saving, investment, and increased wealth [Weber] |
20724 | When asceticism emerged from the monasteries, it helped to drive the modern economy [Weber] |
20717 | Capitalism is not unlimited greed, and may even be opposed to greed [Weber] |
20718 | Modern western capitalism has free labour, business separate from household, and book-keeping [Weber] |
20719 | Punish the heretic, but be indulgent to the sinner [Weber] |