Combining Texts

All the ideas for 'Issues of Pragmaticism', 'Investigations into Logical Deduction' and 'On Mental Entities'

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4 ideas

5. Theory of Logic / H. Proof Systems / 4. Natural Deduction

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Natural deduction shows the heart of reasoning (and sequent calculus is just a tool) [Gentzen, by Hacking]

12. Knowledge Sources / B. Perception / 4. Sense Data / d. Sense-data problems

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Sense-data are dubious abstractions, with none of the plausibility of tables [Quine]

12. Knowledge Sources / D. Empiricism / 4. Pro-Empiricism

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Empiricism says evidence rests on the senses, but that insight is derived from science [Quine]

19. Language / A. Nature of Meaning / 1. Meaning

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The meaning or purport of a symbol is all the rational conduct it would lead to [Peirce]