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Keith Devlin (Devlin's Angle)  
"What Zeno of Citium actually did was found the Stoic school of logic. Though modern mathematical logic is popularly credited as having its beginnings in the syllogistic logic of Aristotle, most of the fundamental notions of contemporary propositional logic began not with Aristotle but with Zeno and the Stoics. As in modern propositional logic, the patterns of reasoning described by Stoic logic are the patterns of interconnection between propositions that are completely independent of what those propositions say. The Stoics examined a number of ways in which two propositions can be combined to give a third, more complicated proposition...."  


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