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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.
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页码:1243 / 1248
页数:6
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