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Abstract
The issue of universals is one of the most primary questions in the scholasticism. There is a long-term debate which is on this issue between the nominalism and the realism. The debate focuses on the question that whether the universal has an extramental reality. Duns Scotus doesn't directly treat the problem of the reality of universals, but rather addresses it though a new way, that is, in the course of determining the principle of individuation. In this course, he accords the individual a true reality and admits as a consequence that the individual is per se intelligible. Thus, Duns Scotus' discussion on the principle of individuation has an important theory meaning and practice meaning.