Rate of Decay of the Bernstein Numbers
@inproceedings{Plichko2012RateOD, title={Rate of Decay of the Bernstein Numbers}, author={Anatolij M. Plichko}, year={2012} }
We show that if a Banach space X contains uniformly complemented `2 ’s then there exists a universal constant b = b(X) > 0 such that for each Banach space Y , and any sequence dn ↓ 0 there is a bounded linear operator T : X → Y with the Bernstein numbers bn(T ) of T satisfying b−1dn ≤ bn(T ) ≤ bdn for all n.
6 Citations
On Shapiro's lethargy theorem and some applications
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Shapiro’s lethargy theorem [48] states that if {An} is any non-trivial linear approximation scheme on a Banach space X ,t hen the sequences of errors of best approximation E(x,An )=i nfa∈An ∥x − an∥X…
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We present an overview of some results about characterization of compactness in which the concept of approximation scheme has had a role. In particular, we present several results that were proved by…
Subspace Condition for Bernstein's Lethargy Theorem
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In this paper, we consider a condition on subspaces in order to improve bounds given in the Bernstein's Lethargy Theorem (BLT) for Banach spaces. Let $d_1 \geq d_2 \geq \dots d_n \geq \dots > 0$ be…
1-1-2014 On Approximation Schemes and Compactness
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We present an overview of some results about characterization of compactness in which the concept of approximation scheme has had a role. In particular, we present several results that were proved by…
Approximation numbers of composition operators on Hp
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Abstract give estimates for the approximation numbers of composition operators on the Hp spaces, 1 ≤ p < ∞
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