Combining Texts
Ideas for
'Parmenides', 'Grundgesetze der Arithmetik 2 (Basic Laws)' and 'Introduction to Mathematical Logic'
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6 ideas
2. Reason / A. Nature of Reason / 1. On Reason
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When questions are doubtful we should concentrate not on objects but on ideas of the intellect [Plato]
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2. Reason / B. Laws of Thought / 5. Opposites
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Opposites are as unlike as possible [Plato]
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2. Reason / C. Styles of Reason / 1. Dialectic
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Plato's 'Parmenides' is the greatest artistic achievement of the ancient dialectic [Hegel on Plato]
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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 / 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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