Combining Philosophers

All the ideas for Agathon, Goodman,N/Quine,W and Augustus De Morgan

expand these ideas     |    start again     |     specify just one area for these philosophers

---

5 ideas

5. Theory of Logic / E. Structures of Logic / 6. Relations in Logic

17744

De Morgan started the study of relations and their properties [De Morgan, by Walicki]

13501

De Morgan found inferences involving relations, which eluded Aristotle's syllogistic [De Morgan, by Hart,WD]

5. Theory of Logic / G. Quantification / 2. Domain of Quantification

17743

De Morgan introduced a 'universe of discourse', to replace Boole's universe of 'all things' [De Morgan, by Walicki]

8. Modes of Existence / E. Nominalism / 1. Nominalism / c. Nominalism about abstracta

17619

We renounce all abstract entities [Goodman/Quine]

10. Modality / C. Sources of Modality / 2. Necessity as Primitive

74	Even God could not undo what has been done [Agathon]