display all the ideas for this combination of texts
4 ideas
12444 | Logic is concerned with the real world just as truly as zoology [Russell] |
10057 | Logic can only assert hypothetical existence [Russell] |
14464 | Logic can be known a priori, without study of the actual world [Russell] |
10053 | Geometrical axioms imply the propositions, but the former may not be true [Russell] |