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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.

Quotients of Banach spaces with the Daugavet property

Kadets V., Shepelska V., Werner D.

Bulletin of the Polish Academy of Sciences. Mathematics

2008

Vol. 56, no 2

131-147

We consider a general concept of Daugavet property with respect to a norming subspace. This concept covers both the usual Daugavet property and its weak* analogue. We introduce and study analogues of narrow operators and rich subspaces in this general setting and apply the results to show that a quotient of L1[0,1] by an l1-subspace need not have the Daugavet property. The latter answers in the negative a question posed to us by A. Pełczyński.

Extremality and differentiability of convex functions

Bourass A., Ferrahi B., Saidou N.

Bulletin of the Polish Academy of Sciences. Mathematics

2003

Vol. 51, no 1

13-29

We study relations between the differentiability and some geometrical properties of convex functions defined on a Banach space. As a consequence, we get a characterization of Radon-Nikodym property in Banach spaces by geometrical properties of convex functions.