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But not everybody was reconciled with this restriction. An example can be found in the Odyssey, where a question is posed why the singer should be forbidden to entertain his listeners with singing as he himself will. Yet, even in this rigid environment of dogmas, some progress took place. Thus, in the 3rd century, Porphyry of Tyros graphically visualized the concept categories of Aristotle. In the 4thcentury of the Christian era, Pappus of Alexandria searched for a science of invention. He named his techniques “heuristics”.
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