亚纯函数的充满圆和公共Borel方向

The Filled Circles and the Common Borel's Direction

设arg^z=θ_o为λ级亚纯函数f(z)的λ级Borel方向(0<λ<+∞) 。若argz=θ_0不是f^1(z)的λ级Borel方向,则存在f(z)的一列λ级充满圆{D_k},k=1,…,使得,n(D_k,f=o)=n(Dk,f=l)

Let argz =θ_0 be a λ - Borel direction of a given meromorphic function f (z) of order λ, where 0<λ<∞. If argz = θ_0 is not a λ - Borel direction of f'(z), then there exists a sequence of filled circles of f′(z):{d_h}, k=1,2,…, sueh that n(D_h,f=0)=n(D_h,f=1).