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'fragments/reports', 'The Very Idea of a Conceptual Scheme' and 'The Principles of Mathematics'
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2 ideas
5. Theory of Logic / B. Logical Consequence / 8. Material Implication
14108
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It would be circular to use 'if' and 'then' to define material implication [Russell]
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14106
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Implication cannot be defined [Russell]
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