Plato had in his dialogues reasoned according to logical principles, but it was Aristotle who first tried to look at the form or structure of reasoning and to work out logical principles which held good what ever the subject under discussion.

• 虽然柏拉图的对话录里也涉及到逻辑推理，但是亚里士多德第一个探讨逻辑推理的形式或结构，并且力求找到一个普遍行之有效的逻辑原理。