Combining Texts

Ideas for 'Parmenides', 'Regressive Method for Premises in Mathematics' and 'Existence,Ontological Commitment and Fictions'

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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]
	Full Idea: The law of contradiction must have been originally discovered by generalising from instances, though, once discovered, it was found to be quite as indubitable as the instances.
	From: Bertrand Russell (Regressive Method for Premises in Mathematics [1907], p.274)

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

232	Opposites are as unlike as possible [Plato]
	Full Idea: Opposites are as unlike as possible.
	From: Plato (Parmenides [c.364 BCE], 159a)