Journal of Inequalities and Applications • Vol 2024 • No 1
Fourth order Hankel determinants for certain subclasses of modified sigmoid-activated analytic functions involving the trigonometric sine function
June 2024 • H. M. Srivastava, Nazar Khan, Muhtarr A. Bah, Ayman Alahmade, Ferdous M. O. Tawfiq, Zainab Syed
Abstract The aim of this paper is to introduce two new subclasses $\mathcal{R}_{\sin }^{m}(\Im )$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>R</mml:mi> <mml:mo>sin</mml:mo> <mml:mi>m</mml:mi> </mml:msubsup> <mml:mo>(</mml:mo> <mml:mi>ℑ</mml:mi> <mml:mo>)</mml:mo> </mml:math> and $\mathcal{R}_{\sin }(\Im )$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi>R</mml:mi> <mml:mo>sin</mml:mo> </mml:msub> <mml:mo>(</mml:mo> <mml:mi>ℑ</mml:mi> <mml:mo>)</mml:…