By Carl Faith

VI of Oregon lectures in 1962, Bass gave simplified proofs of a few "Morita Theorems", incorporating principles of Chase and Schanuel. one of many Morita theorems characterizes while there's an equivalence of different types mod-A R::! mod-B for 2 jewelry A and B. Morita's resolution organizes principles so successfully that the classical Wedderburn-Artin theorem is a straightforward outcome, and furthermore, a similarity classification [AJ within the Brauer workforce Br(k) of Azumaya algebras over a commutative ring ok involves all algebras B such that the corresponding different types mod-A and mod-B which includes k-linear morphisms are identical through a k-linear functor. (For fields, Br(k) contains similarity periods of straightforward significant algebras, and for arbitrary commutative ok, this is often subsumed below the Azumaya [51]1 and Auslander-Goldman [60J Brauer workforce. ) a number of different situations of a marriage of ring conception and type (albeit a shot gun wedding!) are inside the textual content. moreover, in. my try to extra simplify proofs, particularly to do away with the necessity for tensor items in Bass's exposition, I exposed a vein of rules and new theorems mendacity wholely inside ring thought. This constitutes a lot of bankruptcy four -the Morita theorem is Theorem four. 29-and the root for it's a corre spondence theorem for projective modules (Theorem four. 7) urged through the Morita context. As a derivative, this gives origin for a slightly whole conception of straightforward Noetherian rings-but extra approximately this within the introduction.

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Then b

20 Foreword on Set Theory Binary Relations If A is a set, a binary relation in A is a subset flll of the cartesian product A X A. If (a, b) E A X A, then we write a flll b if and only if (a, b) E flll. If flll' denotes the complement A X A - flll of flll in A X A, then flll' is also a binary relation. Jl-l defined by the formula a flll-l b if and only if (b, a) E flll. (What subset of Ax A does flll-l correspond to? ) If B is any subset of A, and if flll is a binary relation in A, then flll induces a binary relation in B.

Minimum) condition is equivalent to the ascending (resp. descending) chain condition. Proof. Assume the maximum condition, and let a l < a2< ... < an < ... be a countable chain of elements of A. Let a be a maximal element in the subset {anln = 1,2, ... } of A. Now a = ak for some k, and hence an = a = ak V n > k. , and let X be a nonempty subset of A. Then X has an element at, and if at is not maximal in X, there is an element a2 E X such that a l < a2 • Hence, assume there exist aI, ... , an E X such that a l < a2 < ...