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Relation between Ann-categories and ring categories

There are different categorifications of the notion of a ring such as Ann-category due to N. T. Quang, ring category due to M. M. Kapranov and V. A. Voevodsky. The main result of this paper is to prove that every axiom in the definition of a ring category, but the axiom x0 = y0, can be deduced from the axiomatics of an Ann-category. © 2010 The Korean Mathematical Society.

 Phung C.T.K., Quang N.T., Thuy N.T.
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