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The "conditionatim"-clause: one of the problems of existential import in the history of logic

The discussion of the question whether one can legitimately infer 'Some man is white' from Έvery man is white' and of the related questions is almost as long as the history of the science of logic itself. 1 I intend, in this paper,* to sketch the already known stages of the discussion and then present in some detail a late-medieval phase which seems to have escaped the historians. This phase is the more interesting because it may be seen as a missing link between the so-called traditional and the modern views.