Combining Texts

All the ideas for 'Vagaries of Definition', 'Investigations into Logical Deduction' and 'Lectures on Ethics'

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5 ideas

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 / 6. Mathematics as Set Theory / a. Mathematics is set theory

8203	All the arithmetical entities can be reduced to classes of integers, and hence to sets [Quine]

19. Language / A. Nature of Meaning / 10. Denial of Meanings

8202	Meaning is essence divorced from things and wedded to words [Quine]

19. Language / E. Analyticity / 4. Analytic/Synthetic Critique

8201	The distinction between meaning and further information is as vague as the essence/accident distinction [Quine]

25. Social Practice / F. Life Issues / 4. Suicide

19739

The maxim for suicide is committed to the value of life, and is thus contradictory [Kant]