Combining Texts

All the ideas for 'The Emperor's New 'Knows'', 'Investigations into Logical Deduction' and 'Proof of an External World'

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

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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]

11. Knowledge Aims / B. Certain Knowledge / 2. Common Sense Certainty

6349	I can prove a hand exists, by holding one up, pointing to it, and saying 'here is one hand' [Moore,GE]

13. Knowledge Criteria / C. External Justification / 6. Contextual Justification / b. Invariantism

12900

How could 'S knows he has hands' not have a fixed content? [Bach]

12901

If contextualism is right, knowledge sentences are baffling out of their context [Bach]

12902

Sceptics aren't changing the meaning of 'know', but claiming knowing is tougher than we think [Bach]