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Geometric properties of noncommutative symmetric spaces of measurable operators and unitary matrix ideals

Czerwińska M., Kamińska A.

Commentationes Mathematicae

2017

Vol 57, No. 1

45--122

This is a review article of geometric properties of noncommutative symmetric spaces of measurable operators E(M., t), where M is a semifinite von Neumann algebra with a faithful, normal, semifinite trace τ, and E is a symmetric function space. If E co is a symmetric sequence space then the analogous properties in the unitary matrix ideals CE are also presented. In the preliminaries we provide basic definitions and concepts illustrated by some examples and occasional proofs. In particular we list and discuss the properties of general singular value function, submajorization in the sense of Hardy, Littlewood and Polya, Kothe duality, the spaces Lp (M, τ), 1 ≤p < ∞, the identification of CE and G(B(H),tr) for some symmetric function space G, the commutative case when E is identified with E(N, t) for N isometric to L∞ with the standard integral trace, trace preserving *-isomorphisms between E and a *-subalgebra of E (M, τ), and a general method for removing the assumption of non-atomicity of . The main results on geometric properties are given in separate sections. We present the results on (complex) extreme points, (complex) strict convexity, strong extreme points and midpoint local uniform convexity, k-extreme points and k-convexity, (complex or local) uniform convexity, smoothness and strong smoothness, (strongly) exposed points, (uniform) Kadec-Klee properties, Banach-Saks properties, Radon-Nikodym property and stability in the sense of Krivine-Maurey. We also state some open problems.

Complex convexity of Orlicz-Lorentz spaces and its applications

Choi C., Kamińska A., Lee H. J.

Bulletin of the Polish Academy of Sciences. Mathematics

2004

Vol. 52, nr 1

19-38

We give sufficient and necessary conditions for complex extreme points of the unit ball of Orlicz-Lorentz spaces, as well as we find criteria for the complex rotundity and uniform complex rotundity of these spaces. As an application we show that the set of norm-attaining operators is dense in the space of bounded linear operators from d* (w, 1) into d(w, 1), where d*(w, 1) is a predual of a complex Lorentz sequence space d[w, 1), if and only if w [is an element of] c0 \ L2.