We discuss the Hankel determinants for typically real functions, that is, analytic functions which satisfy the condition in the unit disk Δ. Main results are concerned with and . The sharp upper and lower bounds are given. In general case, for , the results are not sharp. Moreover, we present some remarks connected with typically real odd functions.
Paweł Zaprawa. "Second Hankel Determinants for the Class of Typically Real Functions." Abstr. Appl. Anal. 2016 1 - 7, 2016. https://doi.org/10.1155/2016/3792367