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'fragments/reports', 'Regressive Method for Premises in Mathematics' and 'Fifteen Sermons'
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2. Reason / A. Nature of Reason / 6. Coherence
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If one proposition is deduced from another, they are more certain together than alone [Russell]
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2. Reason / B. Laws of Thought / 3. Non-Contradiction
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Non-contradiction was learned from instances, and then found to be indubitable [Russell]
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