Combining Texts
Ideas for
'What is Logic?st1=Ian Hacking', 'Grundgesetze der Arithmetik 2 (Basic Laws)' and 'Criterion of Validity in Reasoning'
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5 ideas
2. Reason / A. Nature of Reason / 4. Aims of Reason
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I reason in order to avoid disappointment and surprise [Peirce]
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2. Reason / D. Definition / 2. Aims of Definition
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Later Frege held that definitions must fix a function's value for every possible argument [Frege, by Wright,C]
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2. Reason / D. Definition / 3. Types of Definition
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A decent modern definition should always imply a semantics [Hacking]
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2. Reason / D. Definition / 7. Contextual Definition
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We can't define a word by defining an expression containing it, as the remaining parts are a problem [Frege]
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2. Reason / D. Definition / 11. Ostensive Definition
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Only what is logically complex can be defined; what is simple must be pointed to [Frege]
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