Posner's theorem

In algebra, Posner's theorem states that given a prime polynomial identity algebra A with center Z, the ring ${\displaystyle A\otimes _{Z}Z_{(0)}}${\displaystyle A\otimes _{Z}Z_{(0)}} is a central simple algebra over ${\displaystyle Z_{(0)}}${\displaystyle Z_{(0)}}, the field of fractions of Z.^[1] It is named after Ed Posner.

• Artin, Michael (1999). "Noncommutative Rings" (PDF). Chapter V.
• Formanek, Edward (1991). The polynomial identities and invariants of n×ばつn matrices. Regional Conference Series in Mathematics. Vol. 78. Providence, RI: American Mathematical Society. ISBN 0-8218-0730-7. Zbl 0714.16001.
• Edward C. Posner, Prime rings satisfying a polynomial identity, Proc. Amer. Math. Soc. 11 (1960), pp. 180–183. doi:10.2307/2032951

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