4 ideas
15927 | Definition just needs negation, known variables, conjunction, disjunction, substitution and quantification [Weyl, by Lavine] |
17319 | There are 'conceptual' explanations, with their direction depending on complexity [Schnieder] |
23217 | All of our happiness and misery arises entirely from the brain [Hippocrates] |
10246 | The limit of science is isomorphism of theories, with essences a matter of indifference [Weyl] |