Combining Texts
Ideas for
'Parmenides', 'Logic in Mathematics' and '23: Book of Isaiah'
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6 ideas
2. Reason / A. Nature of Reason / 1. On Reason
224
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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
232
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Opposites are as unlike as possible [Plato]
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2. Reason / C. Styles of Reason / 1. Dialectic
8937
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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 / 3. Types of Definition
16877
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A 'constructive' (as opposed to 'analytic') definition creates a new sign [Frege]
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2. Reason / D. Definition / 10. Stipulative Definition
11219
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Frege suggested that mathematics should only accept stipulative definitions [Frege, by Gupta]
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2. Reason / E. Argument / 6. Conclusive Proof
16878
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We must be clear about every premise and every law used in a proof [Frege]
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