Abstract: A complex-valued harmonic function that is univalent and sense preserving in the unit disk U can be written in the form of f = h + g, where h and g are analytic in U. We define and investigate a new class LH_λ(α,β) by generalized Salagean operator of harmonic univalent functions. We give sufficient coefficient conditions for normalized harmonic functions in the class LH_λ(α,β). These conditions are also shown to be necessary when the coefficients are negative. This leads to distortion bounds and extreme points. 

Key words: harmonic function, Salagean operator, extreme points, distortion bounds