Properties WORTH and WORTH, embeddings in Banach spaces with 1-unconditional basis and wFPP.
Spreading sequences in JT
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 or to the summing basis for J.
Geometric properties related to the fixed point property in Banach spaces.
Fixed points of periodic mappings in Hilbert spaces
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.
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