Hankel determinant for the class of K(α, β)

• Main Authors: Maslina Darus,, Imran Faisal,
• Format: Article
• Published: Penerbit Universiti Kebangsaan Malaysia 2010
• Online Access: http://journalarticle.ukm.my/1975/; http://www.ukm.my/~ppsmfst/jqma/index.html

Let f(z)=z+∑anzn be an analytic function in the open unit disc. A sharp upper bound is obtained for the functional |a2a4-a23| for the class k(α,β) of normalised close-to-convex functions defined in the open unit disc