Mathematics – Category Theory
Scientific paper
2008-04-11
Mathematics
Category Theory
27 pages
Scientific paper
This paper presents the structure conversion by which from an Ann-category $\A,$ we can obtain its reduced Ann-category of the type $(R,M)$ whose structure is a family of five functions $k=(\xi,\eta,\alpha,\lambda,\rho)$. Then we will show that each Ann-category is determined by three invariants: 1. The ring $\Pi_0(\A)$ of the isomorphic classes of objects of $\A$, 2. $\Pi_0(\A)$-bimodule $\Pi_1(\A) = \Aut_{\A}(0),$ 3. The element $ \bar{k}\in H^{3}_{M}(\Pi_0(\A), \Pi_1(\A))$ (the ring cohomology due to MacLane).
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