Ideas from 'Frege' by Joan Weiner [1999], by Theme Structure

[found in 'Frege' by Weiner,Joan [OUP 1999,0-19-287695-3]].

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4. Formal Logic / B. Propositional Logic PL / 1. Propositional Logic
Aristotelian logic dealt with inferences about concepts, and there were also proposition inferences