<p>In this article, we investigate some standard geometric properties of the integral operators <Equation ID="Equ14"> <MediaObject> <ImageObject Color="BlackWhite" FileRef="40840_2025_1824_Article_Equ14.gif" Format="GIF" Height="44" Rendition="HTML" Resolution="72" Type="Linedraw" Width="348" /> </MediaObject> <EquationSource Format="TEX">\(\begin{aligned} J_\alpha [f](z)= \int _{0}^{z}\bigg (\frac{f(w)}{w}\bigg )^\alpha dw, \,\,\, \alpha \in \mathbb {C} \text { and } |z|&lt;1, \end{aligned}\)</EquationSource> <EquationSource Format="MATHML"><math display="block"> <mrow> <mtable> <mtr> <mtd columnalign="right"> <mrow> <msub> <mi>J</mi> <mi>α</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> <msubsup> <mo>∫</mo> <mrow> <mn>0</mn> </mrow> <mi>z</mi> </msubsup> <mrow> <mo maxsize="2.047em" minsize="2.047em" stretchy="true">(</mo> </mrow> <mfrac> <mrow> <mi>f</mi> <mo stretchy="false">(</mo> <mi>w</mi> <mo stretchy="false">)</mo> </mrow> <mi>w</mi> </mfrac> <msup> <mrow> <mo maxsize="2.047em" minsize="2.047em" stretchy="true">)</mo> </mrow> <mi>α</mi> </msup> <mi>d</mi> <mi>w</mi> <mo>,</mo> <mspace width="0.166667em" /> <mspace width="0.166667em" /> <mspace width="0.166667em" /> <mi>α</mi> <mo>∈</mo> <mi mathvariant="double-struck">C</mi> <mspace width="0.333333em" /> <mtext>and</mtext> <mspace width="0.333333em" /> <mrow> <mo stretchy="false">|</mo> <mi>z</mi> <mo stretchy="false">|</mo> </mrow> <mo>&lt;</mo> <mn>1</mn> <mo>,</mo> </mrow> </mtd> </mtr> </mtable> </mrow> </math></EquationSource> </Equation>and <Equation ID="Equ15"> <MediaObject> <ImageObject Color="BlackWhite" FileRef="40840_2025_1824_Article_Equ15.gif" Format="GIF" Height="41" Rendition="HTML" Resolution="72" Type="Linedraw" Width="335" /> </MediaObject> <EquationSource Format="TEX">\(\begin{aligned} I_\beta [g](z)= \int _{0}^{z}\big (g'(w)\big )^\beta dw, \,\,\, \beta \in \mathbb {C} \text { and } |z|&lt;1, \end{aligned}\)</EquationSource> <EquationSource Format="MATHML"><math display="block"> <mrow> <mtable> <mtr> <mtd columnalign="right"> <mrow> <msub> <mi>I</mi> <mi>β</mi> </msub> <mrow> <mo stretchy="false">[</mo> <mi>g</mi> <mo stretchy="false">]</mo> </mrow> <mrow> <mo stretchy="false">(</mo> <mi>z</mi> <mo stretchy="false">)</mo> </mrow> <mo>=</mo> <msubsup> <mo>∫</mo> <mrow> <mn>0</mn> </mrow> <mi>z</mi> </msubsup> <mrow> <mo maxsize="1.2em" minsize="1.2em" stretchy="true">(</mo> </mrow> <msup> <mi>g</mi> <mo>′</mo> </msup> <mrow> <mo stretchy="false">(</mo> <mi>w</mi> <mo stretchy="false">)</mo> </mrow> <msup> <mrow> <mo maxsize="1.2em" minsize="1.2em" stretchy="true">)</mo> </mrow> <mi>β</mi> </msup> <mi>d</mi> <mi>w</mi> <mo>,</mo> <mspace width="0.166667em" /> <mspace width="0.166667em" /> <mspace width="0.166667em" /> <mi>β</mi> <mo>∈</mo> <mi mathvariant="double-struck">C</mi> <mspace width="0.333333em" /> <mtext>and</mtext> <mspace width="0.333333em" /> <mrow> <mo stretchy="false">|</mo> <mi>z</mi> <mo stretchy="false">|</mo> </mrow> <mo>&lt;</mo> <mn>1</mn> <mo>,</mo> </mrow> </mtd> </mtr> </mtable> </mrow> </math></EquationSource> </Equation>where <i>f</i> and <i>g</i> are elements of certain classical families of normalized analytic functions defined on the unit disk. In particular, preserving properties of the Hornich sum of the operators <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="40840_2025_1824_Article_IEq1.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="20" /> </InlineMediaObject> <EquationSource Format="TEX">\(J_\alpha \)</EquationSource> <EquationSource Format="MATHML"><math> <msub> <mi>J</mi> <mi>α</mi> </msub> </math></EquationSource> </InlineEquation> and <InlineEquation ID="IEq2"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="40840_2025_1824_Article_IEq2.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="18" /> </InlineMediaObject> <EquationSource Format="TEX">\(I_\beta \)</EquationSource> <EquationSource Format="MATHML"><math> <msub> <mi>I</mi> <mi>β</mi> </msub> </math></EquationSource> </InlineEquation> will be studied. Moreover, we also present a sharp pre-Schwarzian norm estimate of such integrals.</p>

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Mapping Properties of Certain Nonlinear Integral Operators Involving Hornich Operations

  • Shankey Kumar

摘要

In this article, we investigate some standard geometric properties of the integral operators \(\begin{aligned} J_\alpha [f](z)= \int _{0}^{z}\bigg (\frac{f(w)}{w}\bigg )^\alpha dw, \,\,\, \alpha \in \mathbb {C} \text { and } |z|<1, \end{aligned}\) J α [ f ] ( z ) = 0 z ( f ( w ) w ) α d w , α C and | z | < 1 , and \(\begin{aligned} I_\beta [g](z)= \int _{0}^{z}\big (g'(w)\big )^\beta dw, \,\,\, \beta \in \mathbb {C} \text { and } |z|<1, \end{aligned}\) I β [ g ] ( z ) = 0 z ( g ( w ) ) β d w , β C and | z | < 1 , where f and g are elements of certain classical families of normalized analytic functions defined on the unit disk. In particular, preserving properties of the Hornich sum of the operators \(J_\alpha \) J α and \(I_\beta \) I β will be studied. Moreover, we also present a sharp pre-Schwarzian norm estimate of such integrals.