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Amitsur–Levitzki theorem : ウィキペディア英語版
Amitsur–Levitzki theorem
In algebra, the Amitsur–Levitzki theorem states that the algebra of ''n'' by ''n'' matrices satisfies a certain identity of degree 2''n''. It was proved by . In particular matrix rings are polynomial identity rings such that the smallest identity they satisfy has degree exactly 2''n''.
==Statement==
The standard polynomial of degree ''n'' is
:S_n(x_1,\ldots,x_n) = \sum_(\sigma)x_\cdots x_ \
in non-commutative variables ''x''1,...,''x''''n'', where the sum is taken over all ''n''! elements of the symmetric group ''S''''n''.
The Amitsur–Levitzki theorem states that for ''n'' by ''n'' matrices ''A''1,...,''A''2''n'' then
: S_(A_1,\ldots,A_) = 0 \ .

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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