display all the ideas for this combination of texts
3 ideas
| 9583 | Psychological logicians are concerned with sense of words, but mathematicians study the reference [Frege] |
| 9584 | Identity baffles psychologists, since A and B must be presented differently to identify them [Frege] |
| 19216 | Propositions (such as 'that dog is barking') only exist if their items exist [Williamson] |