Coefficient Bounds for Bi-spirallike Analytic Functions.

In the present paper, we introduce and investigate two new subclasses, namely; the class of strongly a-- bi-spirallike functions of order ß and a-- bi-spirallike functions of order p, of the function class £; of normalized analytic and bi-univalent functions in the open unit disk U = {z:z ă C and |z| < 1}. We find estimates on the coefficients |a2|, |a3| and |a4| for functions in these two subclasses. [ABSTRACT FROM AUTHOR]