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Inversion of a theorem on action of analytic functions and multiplicative properties of some subclasses of the hardy space H∞. / Vinogradov, S. A.; Petrov, A. N.
в: Journal of Mathematical Sciences, Том 92, № 1, 01.01.1998, стр. 3573-3588.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
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TY - JOUR
T1 - Inversion of a theorem on action of analytic functions and multiplicative properties of some subclasses of the hardy space H∞
AU - Vinogradov, S. A.
AU - Petrov, A. N.
PY - 1998/1/1
Y1 - 1998/1/1
N2 - In this paper, function spaces V ∩ lAp(ω) are considered in the context of their multiplicative structure. The space V is determined by conditions on the values of a function in a disk (for example, CA, LipAα). We denote by lA p(ω) the space of power series such that their Taylor coefficients are p-summable with weight s. For an analytic function Φ acting in a space of this type, we prove the following alternative: either Φ′(z) = 0, or the space is a Banach algebra with respect to pointwise multiplication. For a wide class of weights w, we establish the continuity of the identity embedding mult(V ∩ lAp (ω)) → mult lA p. An estimate for the lp-multiplicative norm of random polynomials is found. This estimate can be considered as an extension of the known result by Salem-Zygmund. Bibliography: 10 titles.
AB - In this paper, function spaces V ∩ lAp(ω) are considered in the context of their multiplicative structure. The space V is determined by conditions on the values of a function in a disk (for example, CA, LipAα). We denote by lA p(ω) the space of power series such that their Taylor coefficients are p-summable with weight s. For an analytic function Φ acting in a space of this type, we prove the following alternative: either Φ′(z) = 0, or the space is a Banach algebra with respect to pointwise multiplication. For a wide class of weights w, we establish the continuity of the identity embedding mult(V ∩ lAp (ω)) → mult lA p. An estimate for the lp-multiplicative norm of random polynomials is found. This estimate can be considered as an extension of the known result by Salem-Zygmund. Bibliography: 10 titles.
UR - http://www.scopus.com/inward/record.url?scp=54749090092&partnerID=8YFLogxK
U2 - 10.1007/BF02440141
DO - 10.1007/BF02440141
M3 - Article
AN - SCOPUS:54749090092
VL - 92
SP - 3573
EP - 3588
JO - Journal of Mathematical Sciences
JF - Journal of Mathematical Sciences
SN - 1072-3374
IS - 1
ER -
ID: 27078637