4 ideas
15927 | Definition just needs negation, known variables, conjunction, disjunction, substitution and quantification [Weyl, by Lavine] |
20653 | Six reduction levels: groups, lives, cells, molecules, atoms, particles [Putnam/Oppenheim, by Watson] |
22237 | The Greeks had a single word meaning both 'beautiful' and 'good' [Pormann] |
10246 | The limit of science is isomorphism of theories, with essences a matter of indifference [Weyl] |