The Jordan Algebra of Complex Symmetric Operators

Citation:

Cun WANG,Sen ZHU.The Jordan Algebra of Complex Symmetric Operators[J].Chinese Annals of Mathematics B,2025,46(5):733~758
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Authors:

Cun WANG; Sen ZHU

Foundation:

the National Natural Science Foundation of China (Nos. 12401149, 12171195) and the National Key Research and Development Program of China (No. 2020YFA0714101).
Abstract: For a conjugation C on a separable, complex Hilbert space H, the set SC of Csymmetric operators on H forms a weakly closed, selfadjoint, Jordan operator algebra. In this paper, the authors study SC in comparison with the algebra B(H) of all bounded linear operators on H, and obtain SC-analogues of some classical results concerning B(H). The authors determine the Jordan ideals of SC and their dual spaces. Jordan automorphisms of SC are classified. The authors determine the spectra of Jordan multiplication operators on SC and their different parts. It is proved that those Jordan invertible ones constitute a dense, path connected subset of SC.

Keywords:

Complex symmetric operator  Jordan operator algebra  Cartan factor  Jordan ideal  Automorphism

Classification:

47B99, 46L70, 17C65, 46K70
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