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Ideas for 'Parmenides', 'Logic in Mathematics' and 'talk'

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6 ideas

2. Reason / A. Nature of Reason / 1. On Reason

224	When questions are doubtful we should concentrate not on objects but on ideas of the intellect [Plato]

2. Reason / B. Laws of Thought / 5. Opposites

232	Opposites are as unlike as possible [Plato]

2. Reason / C. Styles of Reason / 1. Dialectic

8937	Plato's 'Parmenides' is the greatest artistic achievement of the ancient dialectic [Hegel on Plato]

2. Reason / D. Definition / 3. Types of Definition

16877

A 'constructive' (as opposed to 'analytic') definition creates a new sign [Frege]

2. Reason / D. Definition / 10. Stipulative Definition

11219

Frege suggested that mathematics should only accept stipulative definitions [Frege, by Gupta]

2. Reason / E. Argument / 6. Conclusive Proof

16878

We must be clear about every premise and every law used in a proof [Frege]