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Strong ball proximinality and continuity of metric projection in L1-predual spaces
, S. Lalithambigai
Published in Academic Press Inc.
2017
Volume: 213
   
Pages: 120 - 135
Abstract
In this article, we discuss the strong proximinality of the closed unit ball of closed linear subspaces of L1-predual spaces. We prove that M-ideals in L1-predual spaces are strongly ball proximinal. We characterize finite co-dimensional strongly ball proximinal closed linear subspaces of C(K) spaces and prove that they are precisely the finite co-dimensional strongly proximinal closed linear subspaces of C(K). For a Choquet simplex K, we give a sufficient condition for the strong ball proximinality of finite co-dimensional closed linear subspaces of A(K) spaces. We prove that metric projection onto a finite co-dimensional strongly proximinal closed linear subspace of an L1-predual space is Hausdorff metric continuous. Moreover, we prove that the metric projection onto the closed unit ball of an M-ideal in an L1-predual space is Hausdorff metric continuous. © 2016 Elsevier Inc.
About the journal
JournalJournal of Approximation Theory
PublisherAcademic Press Inc.
ISSN00219045