4 ideas
15927 | Definition just needs negation, known variables, conjunction, disjunction, substitution and quantification [Weyl, by Lavine] |
12887 | A whole must have one characteristic, an internal relation, and a structure [Rescher/Oppenheim] |
20919 | How can things without weight compose weight? [Alexander] |
10246 | The limit of science is isomorphism of theories, with essences a matter of indifference [Weyl] |