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Currently displaying 1 – 4 of 4

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Spreading sequences in JT

Helga Fetter; B. Gamboa de Buen — 1997

Studia Mathematica

We prove that a normalized non-weakly null basic sequence in the James tree space JT admits a subsequence which is equivalent to the summing basis for the James space J. Consequently, every normalized basic sequence admits a spreading subsequence which is either equivalent to the unit vector basis of $l_{2}$ or to the summing basis for J.

Geometric properties related to the fixed point property in Banach spaces.

Helga Fetter; Berta Gamboa De Buen — 2000

Revista de la Real Academia de Ciencias Exactas Físicas y Naturales

Fixed points of periodic mappings in Hilbert spaces

Victor Perez Garcia; Helga Fetter Nathansky — 2010

Annales Universitatis Mariae Curie-Skłodowska, sectio A – Mathematica

In this paper we give new estimates for the Lipschitz constants of n-periodic mappings in Hilbert spaces, in order to assure the existence of fixed points and retractions on the fixed point set.

Properties WORTH and WORTH $^{*}$ , $(1 + δ)$ embeddings in Banach spaces with 1-unconditional basis and wFPP.

Fetter, Helga; De Buen, Berta Gamboa — 2010

Fixed Point Theory and Applications [electronic only]

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