By George M. Bergman

ISBN-10: 0821804952

ISBN-13: 9780821804957

ISBN-10: 1719801711

ISBN-13: 9781719801713

ISBN-10: 2919781782

ISBN-13: 9782919781782

ISBN-10: 6419485525

ISBN-13: 9786419485522

ISBN-10: 8719582943

ISBN-13: 9788719582949

This e-book reviews representable functors between recognized types of algebras. All such functors from associative earrings over a hard and fast ring $R$ to every of the kinds of abelian teams, associative jewelry, Lie earrings, and to a number of others are made up our minds. effects also are received on representable functors on kinds of teams, semigroups, commutative jewelry, and Lie algebras. The publication encompasses a ``Symbol index'', which serves as a word list of symbols used and a listing of the pages the place the subjects so symbolized are taken care of, and a ``Word and word index''. The authors have strived--and succeeded--in making a quantity that's very hassle-free

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10 we find a projective cover P M −→ M of M as an A-module such that ∼ = P M / Jac(A)P M −→ M. 10 shows that P M in fact is a finitely generated A-module. 8 the isomorphism class {P M } only depends on the isomorphism class {M}. We conclude that Z[MA ] −→ Z[MA ] {M} −→ {P M } is a well-defined homomorphism. If N is a second A-module of finite length with g projective cover P N − → N as above then f ⊕g P M ⊕ P N −−−→ M ⊕ N is surjective with (P M ⊕ P N )/ Jac(A)(P M ⊕ P N ) = P M / Jac(A)P M ⊕ P N / Jac(A)P N ∼ = M ⊕ N.

Before we can establish the finer properties of the Cartan–Brauer triangle we need to develop the theory of induction. 3 The Ring Structure of RF (G), and Induction In this section we let F be an arbitrary field, and we consider the group ring F [G] and its Grothendieck group RF (G) := R(F [G]). 3 The Ring Structure of RF (G), and Induction 55 Let V and W be two (finitely generated) F [G]-modules. The group G acts on the tensor product V ⊗F W by g(v ⊗ w) := gv ⊗ gw for v ∈ V and w ∈ W. In this way V ⊗F W becomes a (finitely generated) F [G]-module, and we obtain the multiplication map Z[MF [G] ] × Z[MF [G] ] −→ Z[MF [G] ] {V }, {W } −→ {V ⊗F W }.

Let e ∈ R be any idempotent. i we must have e ∈ R × . Multiplying the identity e2 = e by e−1 gives e = 1. Now let us assume, vice versa, that 1 is the only idempotent in R. 7, the factor ring R := R/ Jac(R) also has no other idempotent than 1. 1, the R-module L := R is indecomposable. 2, is of finite length. 4 implies that EndR (L) is a local ring. ). We obtain that R and R are local rings. Since Jac(R) = Jac(R/ Jac(R)) = {0} the ring R in fact is a skew field. 1 implies that R is local. 12 Suppose that R is an R0 -algebra, which is finitely generated as an R0 -module, over a noetherian complete commutative ring R0 such that R0 / Jac(R0 ) is artinian; then the map set of all central idempotents in R e −→ −→ set of all central idempotents in R/ Jac(R0 )R e := e + Jac(R0 )R is bijective; moreover, this bijection satisfies: – e, f are orthogonal if and only if e, f are orthogonal; – e is primitive in Z(R) if and only if e is primitive in Z(R/ Jac(R0 )R).

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