23 research outputs found

    Erratum to: “Sharp estimates for functions of class Ŵ 2 r (−1, 1)”

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    Lower estimates of the norms of extension operators for Sobolev spaces on the halfline

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    It is proved that for an arbitrary extension operator T : W-p(m)(-infinity ,0) --> W-p(m)(-infinity,infinity) its norm cannot be less than epsilon (2m)(0)m(-1/2p), epsilon (0) > 0. Previously only the upper estimates (less than or equal to 8(m)) for these norms were known
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