Uniqueness of Entire Functions Sharing Polynomials with Their Derivatives

Abstract EN

We use the theory of normal families to prove the following.

Let Q1(z)=a1zp+a1,p−1zp−1+⋯+a1,0 and Q2(z)=a2zp+a2,p−1zp−1+⋯+a2,0 be two polynomials such that degQ1=degQ2=p (where p is a nonnegative integer) and a1,a2(a2≠0) are two distinct complex numbers.

Let f(z) be a transcendental entire function.

If f(z) and f′(z) share the polynomial Q1(z) CM and if f(z)=Q2(z) whenever f′(z)=Q2(z), then f≡f′.

This result improves a result due to Li and Yi.