Abstract
The univalent function [Formula: see text] maps the open unit disk [Formula: see text] onto a sigmoid domain [Formula: see text]. The sharp radii constants have been computed for the classes involving ratios [Formula: see text] and [Formula: see text] of analytic functions [Formula: see text] and [Formula: see text] defined in [Formula: see text] such that [Formula: see text] is subordinate to [Formula: see text], the other two ratios are subordinate to [Formula: see text], [Formula: see text] or [Formula: see text] and the quantity [Formula: see text] lies in a certain region of the right half plane.
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