Talk:Azumaya algebra

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I am sorry I do not understand the definition: "... makes the tensor product isomorphic to the r×r matrix algebra over R." The tensor product of which objects? Secondly, a definition of Azumaya algebras over arbitrary commutative rings seems to be standard. Does anyone know a reference? Finally, what is the "reduced trace" in this context? Ninte 13:09, 6 January 2007 (UTC)

Okay, I found a textbook myself where everything is explained (Knus/Ojanguren, Springer Lecture Notes 389) Ninte 10:18, 12 January 2007 (UTC)

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