Abstract
In this paper, two subclasses have been established; the open unit disc U = {z ε ₵ |Z|< 1} functions. is defined by convolution and represents a function class of biunivalent Additionally, for functions in these subclasses, initial estimates of the coefficients |a2| and |a3| are derived; however, for biunivalent functions in these classes, the first two coefficients |a2| and |a3| constraints have been founded.
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