Combining Philosophers

All the ideas for Bonaventura, Simone de Beauvoir and Gerhard Gentzen

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10 ideas

5. Theory of Logic / A. Overview of Logic / 2. History of Logic
11022 Gentzen introduced a natural deduction calculus (NK) in 1934 [Gentzen, by Read]
5. Theory of Logic / E. Structures of Logic / 2. Logical Connectives / a. Logical connectives
11065 The inferential role of a logical constant constitutes its meaning [Gentzen, by Hanna]
11023 The logical connectives are 'defined' by their introduction rules [Gentzen]
11213 Each logical symbol has an 'introduction' rule to define it, and hence an 'elimination' rule [Gentzen]
5. Theory of Logic / H. Proof Systems / 4. Natural Deduction
13832 Natural deduction shows the heart of reasoning (and sequent calculus is just a tool) [Gentzen, by Hacking]
6. Mathematics / B. Foundations for Mathematics / 4. Axioms for Number / g. Incompleteness of Arithmetic
10067 Gentzen proved the consistency of arithmetic from assumptions beyond arithmetic [Gentzen, by Musgrave]
8. Modes of Existence / B. Properties / 8. Properties as Modes
16643 Accidents always remain suited to a subject [Bonaventura]
9. Objects / E. Objects over Time / 6. Successive Things
16696 Successive things reduce to permanent things [Bonaventura]
23. Ethics / F. Existentialism / 3. Angst
20761 If existence is absurd it can never have a meaning [Beauvoir]
24. Political Theory / D. Ideologies / 12. Feminism
20746 One is not born, but rather becomes a woman [Beauvoir]