<p>Logarithmic and inverse logarithmic coefficients play a crucial role in the theory of univalent functions. In this study, we focus on the class of starlike functions <InlineEquation ID="IEq3"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="41980_2025_979_Article_IEq3.gif" Format="GIF" Height="20" Rendition="HTML" Resolution="72" Type="Linedraw" Width="25" /> </InlineMediaObject> <EquationSource Format="TEX">\({\mathcal {S}}^*_\rho ,\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <msubsup> <mrow> <mi mathvariant="script">S</mi> </mrow> <mi>ρ</mi> <mo>∗</mo> </msubsup> <mo>,</mo> </mrow> </math></EquationSource> </InlineEquation> defined as <Equation ID="Equ33"> <MediaObject> <ImageObject Color="BlackWhite" FileRef="41980_2025_979_Article_Equ33.gif" Format="GIF" Height="43" Rendition="HTML" Resolution="72" Type="Linedraw" Width="286" /> </MediaObject> <EquationSource Format="TEX">\(\begin{aligned} {\mathcal {S}}^*_\rho = \left\{ f \in {\mathcal {A}}: \frac{z f'(z)}{f(z)} \prec \rho (z), \; z \in {\mathbb {D}} \right\} , \end{aligned}\)</EquationSource> <EquationSource Format="MATHML"><math display="block"> <mrow> <mtable> <mtr> <mtd columnalign="right"> <mrow> <msubsup> <mrow> <mi mathvariant="script">S</mi> </mrow> <mi>ρ</mi> <mo>∗</mo> </msubsup> <mo>=</mo> <mfenced close="}" open="{"> <mi>f</mi> <mo>∈</mo> <mi mathvariant="script">A</mi> <mo>:</mo> <mfrac> <mrow> <mi>z</mi> <msup> <mi>f</mi> <mo>′</mo> </msup> <mrow> <mo stretchy="false">(</mo> <mi>z</mi> <mo stretchy="false">)</mo> </mrow> </mrow> <mrow> <mi>f</mi> <mo stretchy="false">(</mo> <mi>z</mi> <mo stretchy="false">)</mo> </mrow> </mfrac> <mo>≺</mo> <mi>ρ</mi> <mrow> <mo stretchy="false">(</mo> <mi>z</mi> <mo stretchy="false">)</mo> </mrow> <mo>,</mo> <mspace width="0.277778em" /> <mi>z</mi> <mo>∈</mo> <mi mathvariant="double-struck">D</mi> </mfenced> <mo>,</mo> </mrow> </mtd> </mtr> </mtable> </mrow> </math></EquationSource> </Equation>where <InlineEquation ID="IEq4"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="41980_2025_979_Article_IEq4.gif" Format="GIF" Height="21" Rendition="HTML" Resolution="72" Type="Linedraw" Width="156" /> </InlineMediaObject> <EquationSource Format="TEX">\(\rho (z):= 1 + \sinh ^{-1}(z),\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>ρ</mi> <mrow> <mo stretchy="false">(</mo> <mi>z</mi> <mo stretchy="false">)</mo> </mrow> <mo>:</mo> <mo>=</mo> <mn>1</mn> <mo>+</mo> <msup> <mo>sinh</mo> <mrow> <mo>-</mo> <mn>1</mn> </mrow> </msup> <mrow> <mo stretchy="false">(</mo> <mi>z</mi> <mo stretchy="false">)</mo> </mrow> <mo>,</mo> </mrow> </math></EquationSource> </InlineEquation> which maps the unit disk <InlineEquation ID="IEq5"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="41980_2025_979_Article_IEq5.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> onto a petal-shaped domain. This investigation aims to establish bounds for the second Hankel and Toeplitz determinants, with their entries determined by the logarithmic coefficients of <i>f</i> and its inverse <InlineEquation ID="IEq6"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="41980_2025_979_Article_IEq6.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="34" /> </InlineMediaObject> <EquationSource Format="TEX">\(f^{-1},\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <msup> <mi>f</mi> <mrow> <mo>-</mo> <mn>1</mn> </mrow> </msup> <mo>,</mo> </mrow> </math></EquationSource> </InlineEquation> for functions <InlineEquation ID="IEq7"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="41980_2025_979_Article_IEq7.gif" Format="GIF" Height="20" Rendition="HTML" Resolution="72" Type="Linedraw" Width="57" /> </InlineMediaObject> <EquationSource Format="TEX">\(f \in {\mathcal {S}}^*_\rho .\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>f</mi> <mo>∈</mo> <msubsup> <mrow> <mi mathvariant="script">S</mi> </mrow> <mi>ρ</mi> <mo>∗</mo> </msubsup> <mo>.</mo> </mrow> </math></EquationSource> </InlineEquation></p>

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On Coefficient Problems for \(S^*_{\rho }\)

  • Shanmugam Sivaprasad Kumar,
  • Arya Tripathi,
  • Snehal Pannu

摘要

Logarithmic and inverse logarithmic coefficients play a crucial role in the theory of univalent functions. In this study, we focus on the class of starlike functions \({\mathcal {S}}^*_\rho ,\) S ρ , defined as \(\begin{aligned} {\mathcal {S}}^*_\rho = \left\{ f \in {\mathcal {A}}: \frac{z f'(z)}{f(z)} \prec \rho (z), \; z \in {\mathbb {D}} \right\} , \end{aligned}\) S ρ = f A : z f ( z ) f ( z ) ρ ( z ) , z D , where \(\rho (z):= 1 + \sinh ^{-1}(z),\) ρ ( z ) : = 1 + sinh - 1 ( z ) , which maps the unit disk \({\mathbb {D}}\) D onto a petal-shaped domain. This investigation aims to establish bounds for the second Hankel and Toeplitz determinants, with their entries determined by the logarithmic coefficients of f and its inverse \(f^{-1},\) f - 1 , for functions \(f \in {\mathcal {S}}^*_\rho .\) f S ρ .