Combining Philosophers

All the ideas for Kurt Vonnegut, Ullin T. Place and Gerhard Gentzen

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9 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]
15. Nature of Minds / B. Features of Minds / 4. Intentionality / b. Intentionality theories
18088 Intentionality is the mark of dispositions, not of the mental [Place]
16. Persons / F. Free Will / 5. Against Free Will
22352 Out of more than a hundred planets, Earth is the only one with the idea of free will [Vonnegut]
26. Natural Theory / D. Laws of Nature / 8. Scientific Essentialism / c. Essence and laws
18089 Dispositions are not general laws, but laws of the natures of individual entities [Place]