Pre-Stoic Hypothetical Syllogistic in Galen

ABSTRACT: This paper traces the evidence in Galen's Introduction to Logic (Institutio Logica) for a hypothetical syllogistic which predates Stoic propositional logic. It emerges that Galen is one of our main witnesses for such a theory, whose authors are most likely Theophrastus and Eudemus. A reconstruction of this theory is offered which - among other things - allows to solve some apparent textual difficulties in the Institutio Logica.
Keywords Galen  hypothetical syllogistic  Theophrastus  Eudemus  Institutio Logica  modus ponens  Stoic logic
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