
Let \(T_R\) denote the class of functions \(f\) of the form \(f(z)=z +a_2z^2+ \cdots+ a_nz^n+ \dots\), \(z\in\mathbb{D}: =\{z:|z|0\) for \(z\in\mathbb{D} \setminus (-1,1)\) \textit{W. W. Rogosiński}, Math. Z. 35. 93-121 (1932; Zbl 0003.39303)]. The class \(T_R\) of typically real functions has been extended by \textit{J. Szynal} [Ann. Univ. Mariae Curie Skłodowska, Sect. A 48, 193-201 (1994; Zbl 0853.30010)] to the class \(T_R (\lambda)\), \(\lambda>0\), which is defined by the integral formula \[ f(z)= \int^1_{-1} {z\over (1-2xz+z^2)^\lambda} d\mu(x),\;z\in\mathbb{D},\tag{1} \] where \(\mu\) is a probability measure on \([-1,1]\). In this note the authors study some coefficients functionals within the class \(T_R(\lambda)\). Some properties of the Gegenbauer polynomials and the representation (1) play the key role.
Orthogonal polynomials and functions of hypergeometric type (Jacobi, Laguerre, Hermite, Askey scheme, etc.), Gegenbauer polynomials, Computational Mathematics, Coefficient problems for univalent and multivalent functions of one complex variable, Applied Mathematics, Coefficient problems, Typically real functions, coefficients problems, typically real functions
Orthogonal polynomials and functions of hypergeometric type (Jacobi, Laguerre, Hermite, Askey scheme, etc.), Gegenbauer polynomials, Computational Mathematics, Coefficient problems for univalent and multivalent functions of one complex variable, Applied Mathematics, Coefficient problems, Typically real functions, coefficients problems, typically real functions
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