Let L:=-△+V be the Schr?dinger operator on Rn with n ≥ 3,where V is a non-negative potential satisfying △-1(V)∈ L∞(Rn).Let w be an L-harmonic function,dete
The aim of this article is twofold.One aim is to establish the precise forms of Landau-Bloch type theorems for certain polyharmonic mappings in the unit disk by