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'', 'Liberal Individualism and Liberal Neutrality' and 'Lectures 1930-32 (student notes)'
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9 ideas
5. Theory of Logic / A. Overview of Logic / 1. Overview of Logic
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In logic nothing is hidden [Wittgenstein]
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If a sound conclusion comes from two errors that cancel out, the path of the argument must matter [Rumfitt]
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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 / a. Logical connectives
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The sense of a connective comes from primitively obvious rules of inference [Rumfitt]
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Standardly 'and' and 'but' are held to have the same sense by having the same truth table [Rumfitt]
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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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