Hilbert space;
closed linear relation;
nonnegative linear relation;
selfadjoint linear relation;
von Neumann theorem;
ADJOINT;
EXTENSIONS;
OPERATORS;
SUMS;
D O I:
10.1080/03081087.2017.1369930
中图分类号:
O1 [数学];
学科分类号:
0701 ;
070101 ;
摘要:
Assume that T is a linear relation acting between two real or complex Hilbert spaces H and K, respectively. T is shown to be closed if and only if the linear relations T * T and TT * are both selfadjoint linear relations on the corresponding Hilbert spaces H and K, respectively.
机构:
Gheorghe Asachi Tech Univ Iasi, Dept Math & Informat, B Dul Carol I 11, Iasi 700506, RomaniaGheorghe Asachi Tech Univ Iasi, Dept Math & Informat, B Dul Carol I 11, Iasi 700506, Romania
Roman, Marcel
Sandovici, Adrian
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机构:
Gheorghe Asachi Tech Univ Iasi, Dept Math & Informat, B Dul Carol I 11, Iasi 700506, RomaniaGheorghe Asachi Tech Univ Iasi, Dept Math & Informat, B Dul Carol I 11, Iasi 700506, Romania
机构:
Shaanxi Normal Univ, Coll Math & Informat Sci, Xian 710062, Peoples R ChinaShaanxi Normal Univ, Coll Math & Informat Sci, Xian 710062, Peoples R China
Li, Yuan
Busch, Paul
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机构:
Univ York, Dept Math, York YO10 5DD, N Yorkshire, EnglandShaanxi Normal Univ, Coll Math & Informat Sci, Xian 710062, Peoples R China