Combining Texts

All the ideas for 'On Motion', 'Investigations into Logical Deduction' and 'On a supposed right to lie'

expand these ideas     |    start again     |     specify just one area for these texts

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4 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]

23. Ethics / B. Contract Ethics / 3. Promise Keeping

22442

If lies were ever acceptable, with would undermine all duties based on contract [Kant]

23. Ethics / D. Deontological Ethics / 2. Duty

22441

The law will protect you if you tell a truth which results in murder [Kant]

27. Natural Reality / B. Modern Physics / 1. Relativity / a. Special relativity

12709

Motion is not absolute, but consists in relation [Leibniz]