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'Thinking About Mathematics', 'The Theory of Knowledge' and 'A Powers Theory of Modality'
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5. Theory of Logic / E. Structures of Logic / 2. Logical Connectives / a. Logical connectives
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Logical constants seem to be entities in propositions, but are actually pure form [Russell]
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We use logical notions, so they must be objects - but I don't know what they really are [Russell]
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