<p>Let <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11785_2024_1642_Article_IEq1.gif" Format="GIF" Height="12" Rendition="HTML" Resolution="72" Type="Linedraw" Width="15" /> </InlineMediaObject> <EquationSource Format="TEX">\(\mu \)</EquationSource> <EquationSource Format="MATHML"><math> <mi>μ</mi> </math></EquationSource> </InlineEquation> be a finite positive Borel measure on [0,&#xa0;1) and let <InlineEquation ID="IEq2"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11785_2024_1642_Article_IEq2.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="40" /> </InlineMediaObject> <EquationSource Format="TEX">\(H(\mathbb {D})\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>H</mi> <mo stretchy="false">(</mo> <mi mathvariant="double-struck">D</mi> <mo stretchy="false">)</mo> </mrow> </math></EquationSource> </InlineEquation> be the space of all analytic functions in the unit disc <InlineEquation ID="IEq3"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11785_2024_1642_Article_IEq3.gif" Format="GIF" Height="14" Rendition="HTML" Resolution="72" Type="Linedraw" Width="13" /> </InlineMediaObject> <EquationSource Format="TEX">\(\mathbb {D}\)</EquationSource> <EquationSource Format="MATHML"><math> <mi mathvariant="double-struck">D</mi> </math></EquationSource> </InlineEquation>. The Cesàro-like operator <InlineEquation ID="IEq4"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11785_2024_1642_Article_IEq4.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="19" /> </InlineMediaObject> <EquationSource Format="TEX">\(\mathcal {C}_\mu \)</EquationSource> <EquationSource Format="MATHML"><math> <msub> <mi mathvariant="script">C</mi> <mi>μ</mi> </msub> </math></EquationSource> </InlineEquation> is defined in <InlineEquation ID="IEq5"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11785_2024_1642_Article_IEq5.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="40" /> </InlineMediaObject> <EquationSource Format="TEX">\(H(\mathbb {D})\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>H</mi> <mo stretchy="false">(</mo> <mi mathvariant="double-struck">D</mi> <mo stretchy="false">)</mo> </mrow> </math></EquationSource> </InlineEquation> as follows: If <InlineEquation ID="IEq6"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11785_2024_1642_Article_IEq6.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="73" /> </InlineMediaObject> <EquationSource Format="TEX">\(f \in H(\mathbb {D})\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>f</mi> <mo>∈</mo> <mi>H</mi> <mo stretchy="false">(</mo> <mi mathvariant="double-struck">D</mi> <mo stretchy="false">)</mo> </mrow> </math></EquationSource> </InlineEquation>, <InlineEquation ID="IEq7"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11785_2024_1642_Article_IEq7.gif" Format="GIF" Height="20" Rendition="HTML" Resolution="72" Type="Linedraw" Width="185" /> </InlineMediaObject> <EquationSource Format="TEX">\(f(z)=\sum _{n=0}^{\infty }a_{n}z^{n} (z\in \mathbb {D})\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>f</mi> <mrow> <mo stretchy="false">(</mo> <mi>z</mi> <mo stretchy="false">)</mo> </mrow> <mo>=</mo> <msubsup> <mo>∑</mo> <mrow> <mi>n</mi> <mo>=</mo> <mn>0</mn> </mrow> <mi>∞</mi> </msubsup> <msub> <mi>a</mi> <mi>n</mi> </msub> <msup> <mi>z</mi> <mi>n</mi> </msup> <mrow> <mo stretchy="false">(</mo> <mi>z</mi> <mo>∈</mo> <mi mathvariant="double-struck">D</mi> <mo stretchy="false">)</mo> </mrow> </mrow> </math></EquationSource> </InlineEquation>, then <Equation ID="Equ6"> <MediaObject> <ImageObject Color="BlackWhite" FileRef="11785_2024_1642_Article_Equ6.gif" Format="GIF" Height="54" Rendition="HTML" Resolution="72" Type="Linedraw" Width="280" /> </MediaObject> <EquationSource Format="TEX">\( \mathcal {C}_\mu (f)(z)=\sum ^\infty _{n=0}\left( \mu _n\sum ^n_{k=0}a_k\right) z^n, \ z\in \mathbb {D}, \)</EquationSource> <EquationSource Format="MATHML"><math display="block"> <mrow> <msub> <mi mathvariant="script">C</mi> <mi>μ</mi> </msub> <mrow> <mo stretchy="false">(</mo> <mi>f</mi> <mo stretchy="false">)</mo> </mrow> <mrow> <mo stretchy="false">(</mo> <mi>z</mi> <mo stretchy="false">)</mo> </mrow> <mo>=</mo> <munderover> <mo>∑</mo> <mrow> <mi>n</mi> <mo>=</mo> <mn>0</mn> </mrow> <mi>∞</mi> </munderover> <mfenced close=")" open="("> <msub> <mi>μ</mi> <mi>n</mi> </msub> <munderover> <mo>∑</mo> <mrow> <mi>k</mi> <mo>=</mo> <mn>0</mn> </mrow> <mi>n</mi> </munderover> <msub> <mi>a</mi> <mi>k</mi> </msub> </mfenced> <msup> <mi>z</mi> <mi>n</mi> </msup> <mo>,</mo> <mspace width="4pt" /> <mi>z</mi> <mo>∈</mo> <mi mathvariant="double-struck">D</mi> <mo>,</mo> </mrow> </math></EquationSource> </Equation>where, for <InlineEquation ID="IEq8"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11785_2024_1642_Article_IEq8.gif" Format="GIF" Height="15" Rendition="HTML" Resolution="72" Type="Linedraw" Width="43" /> </InlineMediaObject> <EquationSource Format="TEX">\(n\ge 0\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>n</mi> <mo>≥</mo> <mn>0</mn> </mrow> </math></EquationSource> </InlineEquation>, <InlineEquation ID="IEq9"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11785_2024_1642_Article_IEq9.gif" Format="GIF" Height="12" Rendition="HTML" Resolution="72" Type="Linedraw" Width="21" /> </InlineMediaObject> <EquationSource Format="TEX">\(\mu _n\)</EquationSource> <EquationSource Format="MATHML"><math> <msub> <mi>μ</mi> <mi>n</mi> </msub> </math></EquationSource> </InlineEquation> denotes the <i>n</i>-th moment of the measure <InlineEquation ID="IEq10"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11785_2024_1642_Article_IEq10.gif" Format="GIF" Height="12" Rendition="HTML" Resolution="72" Type="Linedraw" Width="15" /> </InlineMediaObject> <EquationSource Format="TEX">\(\mu \)</EquationSource> <EquationSource Format="MATHML"><math> <mi>μ</mi> </math></EquationSource> </InlineEquation>, that is, <InlineEquation ID="IEq11"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11785_2024_1642_Article_IEq11.gif" Format="GIF" Height="25" Rendition="HTML" Resolution="72" Type="Linedraw" Width="114" /> </InlineMediaObject> <EquationSource Format="TEX">\(\mu _n=\int _{0}^{1} t^{n}d\mu (t)\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <msub> <mi>μ</mi> <mi>n</mi> </msub> <mo>=</mo> <msubsup> <mo>∫</mo> <mrow> <mn>0</mn> </mrow> <mn>1</mn> </msubsup> <msup> <mi>t</mi> <mi>n</mi> </msup> <mi>d</mi> <mi>μ</mi> <mrow> <mo stretchy="false">(</mo> <mi>t</mi> <mo stretchy="false">)</mo> </mrow> </mrow> </math></EquationSource> </InlineEquation>. The Cesàro-like operator <InlineEquation ID="IEq12"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11785_2024_1642_Article_IEq12.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="19" /> </InlineMediaObject> <EquationSource Format="TEX">\(\mathcal {C}_\mu \)</EquationSource> <EquationSource Format="MATHML"><math> <msub> <mi mathvariant="script">C</mi> <mi>μ</mi> </msub> </math></EquationSource> </InlineEquation> has been studied in various distinct analytic function spaces recently. However, it has rarely been studied on analytic function spaces with more sophisticated structures, such as <i>F</i>(<i>p</i>,&#xa0;<i>q</i>,&#xa0;<i>s</i>) type spaces. In this article, we characterize the positive Borel measures <InlineEquation ID="IEq13"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11785_2024_1642_Article_IEq13.gif" Format="GIF" Height="12" Rendition="HTML" Resolution="72" Type="Linedraw" Width="15" /> </InlineMediaObject> <EquationSource Format="TEX">\(\mu \)</EquationSource> <EquationSource Format="MATHML"><math> <mi>μ</mi> </math></EquationSource> </InlineEquation> for which the operator <InlineEquation ID="IEq14"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11785_2024_1642_Article_IEq14.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="19" /> </InlineMediaObject> <EquationSource Format="TEX">\(\mathcal {C}_\mu \)</EquationSource> <EquationSource Format="MATHML"><math> <msub> <mi mathvariant="script">C</mi> <mi>μ</mi> </msub> </math></EquationSource> </InlineEquation> is bounded and compact on Bergman–Morrey space <InlineEquation ID="IEq15"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11785_2024_1642_Article_IEq15.gif" Format="GIF" Height="17" Rendition="HTML" Resolution="72" Type="Linedraw" Width="32" /> </InlineMediaObject> <EquationSource Format="TEX">\(A^{p,\lambda }\)</EquationSource> <EquationSource Format="MATHML"><math> <msup> <mi>A</mi> <mrow> <mi>p</mi> <mo>,</mo> <mi>λ</mi> </mrow> </msup> </math></EquationSource> </InlineEquation>.</p>

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Cesàro-like Operator on Bergman–Morrey Spaces

  • Pengcheng Tang

摘要

Let \(\mu \) μ be a finite positive Borel measure on [0, 1) and let \(H(\mathbb {D})\) H ( D ) be the space of all analytic functions in the unit disc \(\mathbb {D}\) D . The Cesàro-like operator \(\mathcal {C}_\mu \) C μ is defined in \(H(\mathbb {D})\) H ( D ) as follows: If \(f \in H(\mathbb {D})\) f H ( D ) , \(f(z)=\sum _{n=0}^{\infty }a_{n}z^{n} (z\in \mathbb {D})\) f ( z ) = n = 0 a n z n ( z D ) , then \( \mathcal {C}_\mu (f)(z)=\sum ^\infty _{n=0}\left( \mu _n\sum ^n_{k=0}a_k\right) z^n, \ z\in \mathbb {D}, \) C μ ( f ) ( z ) = n = 0 μ n k = 0 n a k z n , z D , where, for \(n\ge 0\) n 0 , \(\mu _n\) μ n denotes the n-th moment of the measure \(\mu \) μ , that is, \(\mu _n=\int _{0}^{1} t^{n}d\mu (t)\) μ n = 0 1 t n d μ ( t ) . The Cesàro-like operator \(\mathcal {C}_\mu \) C μ has been studied in various distinct analytic function spaces recently. However, it has rarely been studied on analytic function spaces with more sophisticated structures, such as F(pqs) type spaces. In this article, we characterize the positive Borel measures \(\mu \) μ for which the operator \(\mathcal {C}_\mu \) C μ is bounded and compact on Bergman–Morrey space \(A^{p,\lambda }\) A p , λ .