On the exactness of certain inequalities in approximation theory |
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Authors: | V É Geit |
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Institution: | 1. Ural State University, USSR
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Abstract: | We prove the following: for every sequence {Fv}, Fv ? 0, Fv > 0 there exists a functionf such that - En(f)?Fn (n=0, 1, 2, ...) and
- Akn?k? v=1 n vk?1 Fv?1?Ωk (f, n?1) (n=1, 2, ...).
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