5 ideas
10304 | Very few things in set theory remain valid in intuitionist mathematics [Bernays] |
10303 | Restricted Platonism is just an ideal projection of a domain of thought [Bernays] |
10306 | Mathematical abstraction just goes in a different direction from logic [Bernays] |
18521 | The criterion of existence is the possibility of action [Santayana] |
490 | Everything happens by reason and necessity [Leucippus] |