By Dinh V. Huynh, S. K. Jain, and S. R. López-Permouth

This quantity includes contributions via audio system at a convention on Algebra and Its functions that happened in Athens, Ohio, in March of 2005. It offers a photograph of the variety of topics and purposes that curiosity algebraists at the present time. The papers during this quantity comprise many of the most up-to-date leads to the idea of modules, noncommutative jewelry, illustration idea, matrix concept, linear algebra over noncommutative earrings, cryptography, error-correcting codes over finite jewelry, and projective-geometry codes, in addition to expository articles that might offer algebraists and different mathematicians, together with graduate scholars, with an obtainable creation to parts outdoor their very own services. The e-book will serve either the professional searching for the most recent end result and the amateur looking an obtainable reference for a number of the principles and effects provided the following

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Additional resources for Algebra and Its Applications

Example text

Let VR be a quasi-progenerator with S = End(VR ) and B = BiEnd(VR ) = End( S V ). Then VB is a quasi-progenerator and R is V -dense in B. Proof. Since VR is a quasi-progenerator, Gen(VR ) is closed under submodules. Thus, if X R ≤ V n , then X = TrV (X ), and if f : V → X, then there are s1 , . . , sn ∈ S such that f (v) = (s1 v, . . , sn v) for all v ∈ V. But then if b ∈ B, we have f (v)b = (s1 (vb), . . , sn (vb)) = f (vb) ∈ X. Thus X B = X and Hom B (V, X ) = Hom R (V, X ). In particular, (v1 , .

1 that whenever VR is a tilting module over an arbitrary ring, Ext1R (V, R) is finitely generated in Mod-End(VR ). 6. If U R is a partial tilting module such that Ext1R (U, R) is finitely generated over S = End(U R ) (for example, if R is an artin algebra), then U R is a direct summand of a tilting module. Proof. 5. 7 applies. Of course, if R is an artin algebra, then VR is automatically finitely presented. 5. The Tilting Theorem The raison d’ˆetre of a tilting module VR is that it (though not as thoroughly as a progenerator) provides a connection between the categories of modules over R and S = End(VR ).

Proof. 3, Gen(VR ) = VR⊥ = T , and so it follows at once that, since VR⊥ is closed under extensions, T = Gen(VR ) is a torsion class. 2 the corresponding torsion-free class must be Ker H = F. 5, VR is a ∗-module. 5. 5, Cogen(VS∗ ) = Ker T = E, so E is a torsion-free class, and since, by adjointness, Hom S (N , VS∗ ) ∼ = Hom R ((N ⊗ S V ), C) with C R an injective cogenerator, the corresponding torsion class is Ker( ⊗ S V ) = S. Thus we see that (T , F) and (S, E) are torsion theories in Mod-R and Mod-S, respectively.

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