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Ideas for 'From an Ontological Point of View', 'Intro to 'The Reason's Proper Study'' and 'Investigations into Logical Deduction'

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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]

5. Theory of Logic / L. Paradox / 6. Paradoxes in Language / c. Grelling's paradox

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If 'x is heterological' iff it does not apply to itself, then 'heterological' is heterological if it isn't heterological [Hale/Wright]