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:
Consejo Nacl Invest Cient & Tecn, Inst Argentino Matemat Alberto P Calderon, Saavedra 15 3ER Piso, RA-1083 Buenos Aires, DF, Argentina
Univ Nacl Gen Sarmiento, JM Gutierrez 1150, RA-1613 Los Polvorines, ArgentinaConsejo Nacl Invest Cient & Tecn, Inst Argentino Matemat Alberto P Calderon, Saavedra 15 3ER Piso, RA-1083 Buenos Aires, DF, Argentina
机构:
Kazan Volga Reg Fed Univ, NI Lobachevskii Inst Math & Mech, Kazan 420008, Tatarstan, RussiaKazan Volga Reg Fed Univ, NI Lobachevskii Inst Math & Mech, Kazan 420008, Tatarstan, Russia
Bikchentaev, A. M.
Abed, S. A.
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机构:
Kazan Volga Reg Fed Univ, NI Lobachevskii Inst Math & Mech, Kazan 420008, Tatarstan, RussiaKazan Volga Reg Fed Univ, NI Lobachevskii Inst Math & Mech, Kazan 420008, Tatarstan, Russia