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Ideas for 'Parmenides', 'Regressive Method for Premises in Mathematics' and 'An Analysis of Knowledge and Valuation'

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2 ideas

2. Reason / B. Laws of Thought / 3. Non-Contradiction

17632

Non-contradiction was learned from instances, and then found to be indubitable [Russell]

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

232	Opposites are as unlike as possible [Plato]