2004 年 56 巻 1 号 p. 169-176
In this paper first we prove that if f and g are two permutable tran-scendental entire functions satisfying f=f1(h) and g=g1(h), for some transcendental entire function h, rational function f1 and a function g1, which is analytic in the range of h, then F(g)⊂ F(f). Then as an application of this result, we show that if f(z)=p(z)eq(z)+c, where c is a constant, p a nonzero polynomial and q a nonconstant polynomial, or f(z)=\displaystyle ∈tzp(z)eq(z)dz, where p, q are nonconstant polynomials, such that f(g)=g(f) for a nonconstant entire function g, then J(f)=J(g).
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