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Ideas for
'Lectures 1930-32 (student notes)', 'The philosophical basis of intuitionist logic' and 'A Matter of Principle'
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7 ideas
5. Theory of Logic / A. Overview of Logic / 1. Overview of Logic
18724
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In logic nothing is hidden [Wittgenstein]
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5. Theory of Logic / C. Ontology of Logic / 4. Logic by Convention
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Laws of logic are like laws of chess - if you change them, it's just a different game [Wittgenstein]
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5. Theory of Logic / D. Assumptions for Logic / 3. Contradiction
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Contradiction is between two rules, not between rule and reality [Wittgenstein]
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5. Theory of Logic / E. Structures of Logic / 2. Logical Connectives / c. not
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We may correctly use 'not' without making the rule explicit [Wittgenstein]
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5. Theory of Logic / E. Structures of Logic / 2. Logical Connectives / d. and
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Saying 'and' has meaning is just saying it works in a sentence [Wittgenstein]
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5. Theory of Logic / F. Referring in Logic / 1. Naming / a. Names
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A person's name doesn't mean their body; bodies don't sit down, and their existence can be denied [Wittgenstein]
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5. Theory of Logic / G. Quantification / 1. Quantification
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Classical quantification is an infinite conjunction or disjunction - but you may not know all the instances [Dummett]
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