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'On the Question of Absolute Undecidability', 'New Proof of Possibility of Well-Ordering' and 'On the Syllogism IV'
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5. Theory of Logic / E. Structures of Logic / 6. Relations in Logic
17744
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De Morgan started the study of relations and their properties [De Morgan, by Walicki]
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13501
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De Morgan found inferences involving relations, which eluded Aristotle's syllogistic [De Morgan, by Hart,WD]
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