4 ideas
15927 | Definition just needs negation, known variables, conjunction, disjunction, substitution and quantification [Weyl, by Lavine] |
1556 | By nature people are close to one another, but culture drives them apart [Hippias] |
16736 | Explanation is generally to deduce it from something better known, which comes in degrees [Boyle] |
16737 | The best explanations get down to primary basics, but others go less deep [Boyle] |