대한수학회보 (Bulletin of the Korean Mathematical Society)

  • 제61권4호
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  • Pages.959-968
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  • 2024
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  • 1015-8634(pISSN)
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  • 2234-3016(eISSN)
대한수학회 (Korean Mathematical Society)
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THE GROWTH OF BLOCH FUNCTIONS IN SOME SPACES

  • Wenwan Yang (School of Mathematics and Statistics Guangdong University of Technology) ;
  • Junming Zhugeliu (School of Mathematics and Statistics Guangdong University of Technology)
  • 투고 : 2023.09.12
  • 심사 : 2023.12.21
  • 발행 : 2024.07.31
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초록

Suppose f belongs to the Bloch space with f(0) = 0. For 0 < r < 1 and 0 < p < ∞, we show that $$M_p(r,\,f)\,=\,({\frac{1}{2\pi}}{\int_{0}^{2\pi}}\,{\mid}f(re^{it}){\mid}^pdt)^{1/p}\,{\leq}\,({\frac{{\Gamma}(\frac{p}{2}+1)}{{\Gamma}(\frac{p}{2}+1-k)}})^{1/p}\,{\rho}{\mathcal{B}}(log\frac{1}{1-r^2})^{1/2},$$ where ρʙ(f) = supz∈ⅅ(1 - |z|2)|f'(z)| and k is the integer satisfying 0 < p - 2k ≤ 2. Moreover, we prove that for 0 < r < 1 and p > 1, $${\parallel}f_r{\parallel}_{B_q}\,{\leq}\,r\,{\rho}{\mathcal{B}}(f)(\frac{1}{(1-r^2)(q-1)})^{1/q},$$ where fr(z) = f(rz) and ||·||ʙq is the Besov seminorm given by ║f║ʙq = (∫𝔻 |f'(z)|q(1-|z|2)q-2dA(z)). These results improve previous results of Clunie and MacGregor.

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참고문헌

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