Combining Texts

Ideas for 'fragments/reports', 'Beitrage' and 'Logicism in the 21st Century'

expand these ideas     |    start again     |     choose another area for these texts

display all the ideas for this combination of texts

---

2 ideas

18. Thought / E. Abstraction / 2. Abstracta by Selection

9145	We form the image of a cardinal number by a double abstraction, from the elements and from their order [Cantor]

18. Thought / E. Abstraction / 7. Abstracta by Equivalence

8786	One first-order abstraction principle is Frege's definition of 'direction' in terms of parallel lines [Hale/Wright]