Marx–Strohhäcker theorem for multivalent functions.

Some differential implications of classical Marx–Strohhäcker theorem are extended for multivalent functions. These results are also generalized for functions with fixed second coefficient by using the theory of first order differential subordination which in turn, corrects the results of Selvaraj and Stelin (Int J Math Anal 9(18): 883–895, 2015). [ABSTRACT FROM AUTHOR]