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] |
3583 | External objects are permanent possibilities of sensation [Mill] |
3537 | I judge others' feeling by analogy with my body and behaviour [Mill] |