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The Bishop-Phelps-Bollobas property for bilinear forms and polynomials: This paper is dedicated to the memory of Joram Lindenstrauss and Robert Phelps

机译:双线性形式和多项式的Bishop-Phelps-Bollobas属性:本文致力于纪念Joram Lindenstrauss和Robert Phelps

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摘要

For a σ-finite measure μ and a Banach space Y we study the Bishop-Phelps-Bollobas property (BPBP) for bilinear forms on L_1(μ) × Y, that is, a (continuous) bilinear form on L_1(μ) × Y almost attaining its norm at (f_0,y_0) can be approximated by bilinear forms attaining their norms at unit vectors close to (f_0,y_0). In case that Y is an Asplund space we characterize the Banach spaces Y satisfying this property. We also exhibit some class of bilinear forms for which the BPBP does not hold, though the set of norm attaining bilinear forms in that class is dense.
机译:对于σ有限度量μ和Banach空间Y,我们研究L_1(μ)×Y上双线性形式的Bishop-Phelps-Bollobas性质(BPBP),即L_1(μ)×上的(连续)双线性形式几乎可以在(f_0,y_0)处达到其范数的Y可以通过在接近(f_0,y_0)的单位矢量处达到其范数的双线性形式来近似。在Y是Asplund空间的情况下,我们表征满足该属性的Banach空间Y。我们还展示了BPBP不适用的一类双线性形式,尽管在该类中获得双线性形式的范数是密集的。

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