Combining Philosophers

All the ideas for Kurt Vonnegut, Simone de Beauvoir and Augustus De Morgan

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6 ideas

5. Theory of Logic / E. Structures of Logic / 6. Relations in Logic
De Morgan started the study of relations and their properties [De Morgan, by Walicki]
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
De Morgan introduced a 'universe of discourse', to replace Boole's universe of 'all things' [De Morgan, by Walicki]
16. Persons / F. Free Will / 5. Against Free Will
Out of more than a hundred planets, Earth is the only one with the idea of free will [Vonnegut]
23. Ethics / F. Existentialism / 3. Angst
If existence is absurd it can never have a meaning [Beauvoir]
24. Political Theory / D. Ideologies / 12. Feminism
One is not born, but rather becomes a woman [Beauvoir]