A NONCOMMUTATIVE VERSION OF THE FEJER-RIESZ THEOREM

被引:3
|
作者
Savchuk, Yurii [1 ]
Schmuedgen, Konrad [1 ]
机构
[1] Univ Leipzig, Math Inst, D-04103 Leipzig, Germany
关键词
Fejer-Riesz theorem; noncommutative Positivstellensatz; Toeplitz algebra;
D O I
10.1090/S0002-9939-09-10215-0
中图分类号
O29 [应用数学];
学科分类号
070104 ;
摘要
Let X be the unital *-algebra generated by the unilateral shift operator. It is shown that for any nonnegative operator X is an element of X there is an element Y is an element of X such that X = Y*Y.
引用
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页码:1243 / 1248
页数:6
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