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The law of contradiction answers the question of "how many" characters the object has, but on the other hand, the dialectical contradiction gives the answer to the question of "what" characters are.
从本体论看,形式逻辑的客观基础是“对象性状唯一性”,矛盾律回答的是对象性状“有几个”的问题,辩证矛盾回答的是“是什么”的问题。