A criterion for -valently starlikeness.
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Colloquium Mathematicae
We derive a sharp bound for the modulus of the Schwarzian derivative of concave univalent functions with opening angle at infinity less than or equal to πα, α ∈ [1,2].
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General Mathematics
M. Chuaqui, B. Osgood (1994)
Commentarii mathematici Helvetici
Shinji Yamashita (1976)
Monatshefte für Mathematik
Duane W. DeTemple (1972)
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Douglas Michael Campbell (1975)
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R.J.V. Jackson (1981)
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