For a generalized bi-univalent function class HΣ(τ,λ,δ;φ), the authors derive the bound |a2a4 − a3^2| ≤ B1|τ|^2(P+Q+R).
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Upper bound of second Hankel determinant of subclass of bi-univalent functions defined by subordination
For a generalized bi-univalent function class HΣ(τ,λ,δ;φ), the authors derive the bound |a2a4 − a3^2| ≤ B1|τ|^2(P+Q+R).