Calkin's theorem on ideals of B(H)
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Problem 11.5 from Бородин П.А., Савчук А.М., Шейпак И.А. "Задачи по функциональному анализу" [БСШ17]More problems in Section 11.1 "General properties of compact operators"
(J. Calkin, 1941). Let H be a separable Hilbert space. Prove that the unique nontrivial proper closed two-sided ideal in is .
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Problem 493 from Kirillov A.A., Gvishiani A.D. "Теоремы и задачи функционального анализа" [KiGv88]More problems in Subsection III.5.2 "Operators in Hilbert Space"
Find all the norm-closed ideals in the algebra (see Problem 492) for a separable Hilbert space .
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Origin: Stated according to the original source
References
[БСШ17] Бородин П.А., Савчук А.М., Шейпак И.А. Задачи по функциональному анализу. МЦНМО, 2017.
[KiGv88] Kirillov A.A., Gvishiani A.D. Теоремы и задачи функционального анализа. 2-е изд., Наука, 1988.