研究了微分方程f~(k)+A_(k-1)f~(k-1)+…A_2f″+A_1e~(az~n)f′+A_0e~(bz~n)f=F解的增长性,其中A0(z)、A1(z)、F(z)是级小于n的整函数,A j(z)(j=2,3,…,k 1)是次数不超过m的多项式,a、b为非零复常数.证明了该方程的所有解f(z)满足(f)=λ(f)=σ(f)=∞,2(f)=λ2(f)=σ2(f)=n,至多除去2个例外复数b.
The growth for solutions of a differential equationfk+Ak-1fk-1+…A2f″+A1eaznf′+A0ebznf=F has been investigated,where A0(z),A1(z) and F(z)are entire functions with order less than n,Aj(z)(j=2,3,…,k-1) are polynomials with degree no more than m,a and b are nonzero complex numbers,then every solution f(z) of the above equation satisfies (f)=λ(f)=σ(f)=∞,2(f)=λ2(f)=σ2(f)=n,except at most two exceptional complex numbers b.