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Abstract
This dissertation consists of a philosophico-historical study of Duns Scotus' theory of individuation. In order to do justice to the history of philosophy, it grants a fair hearing to the problem of individuation as he conceived it, his criticisms of various theories available at his time, and his own intriguing theory of haecceitas. His doctrines of the formal distinction, the real unity of the common nature, and ultimate differences are studied in some detail because his explanation of haecceitas by a triple analogy between the individual difference and the specific difference presupposed them. From a philosophical point of view, however, it is useful to study a contemporary counterpart of haecceitas in order to understand Scotus' conception better. Thus, this study attempts to show that the widespread interpretation of haecceitas as an individual essence or a coordinate quality is not supported by Scotus' major writings. Haecceitas, in fact, is somewhat similar to Bergmann's bare particular. So, a comparison of haecceitas and the bare particular is drawn in order to understand the similarities and differences between them and understand Scotus' theory better.
