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The Polynomial Numerical Index of Lp(μ)

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주제분류수학

초록

We show that for 1 < p < ∞, k,m ∈ N, n(k)(lp) = inf{n(k)(lm p ) : m ∈ N}and that for any positive measure μ, n(k)(Lp(μ)) ≥ n(k)(lp). We also prove that for every Q ∈ P(klp : lp) (1 < p < ∞), if v(Q) = 0, then ∥Q∥ = 0.

Abstract

We show that for 1 < p < ∞, k,m ∈ N, n(k)(lp) = inf{n(k)(lm p ) : m ∈ N}and that for any positive measure μ, n(k)(Lp(μ)) ≥ n(k)(lp). We also prove that for every Q ∈ P(klp : lp) (1 < p < ∞), if v(Q) = 0, then ∥Q∥ = 0.

참고문헌 (12)

  1. F. F. Bonsall, "Numerical Ranges of Operators on Normed Spaces and of Elements of Normed Algebras" (1971), Cambridge Univ. Press
  2. F. F. Bonsall, "Numerical Ranges II" (1973), Cambridge Univ. Press
  3. Y. S. Choi, "Norm or numerical radius attaining multilinear mappings and polynomials", J. London Math. Soc, 54, pp.135~147 (1996)
  4. Y. S. Choi, "The polynomial numerical index of a Banach space", Proc. Edinburgh Math. Soc., 49, pp.39~52 (2006)
  5. Y. S. Choi, "Composition, numerical range and Aron-Berner extension", Math. Scand., 103, pp.97~110 (2008)
  6. S. Dineen, "Complex Analysis on In nite Dimensional Spaces" (1999), Springer-Verlag
  7. J. Duncan, "The numerical index of a normed space", J. London Math. Soc., 2, pp.481~488 (1970)
  8. Sung Guen Kim, "Norm and Numerical Radius of 2-homogeneous Polynomials on the Real Space l^{2}_{p}, (1 < p < infinite)", Kyungpook Mathematical Journal, 48(3), pp.387~393 (2008), 경북대학교 자연과학대학 수학과
  9. S. G. Kim, "Three kinds of numerical indices of a Banach space", Math. Proc. Royal Irish Acad., 112A, pp.21~35 (2012)
  10. S. G. Kim, "On the polynomial numerical index of the real spaces c0, ℓ1, ℓ1", J. Math. Anal. Appl., 337, pp.98~106 (2008)
  11. H. J. Lee, "Banach spaces with polynomial numerical index 1", Bull. Lond. Math. Soc., 40, pp.193~198 (2008)
  12. G. Lumer, "Semi-inner-product spaces", Trans. Amer. Math. Soc., 100, pp.29~43 (1961)

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