On value distribution of certain delay-differential polynomials
Nan Lia,*, Lianzhong Yangb
ABSTRACT: : Given an entire function f of finite order ?, let L(z, f ) = Pm
j=0
bj
(z)f
(kj
)
(z+cj
) be a linear delay-differential
polynomial of f with small coefficients in the sense of O(r
?+"
) + S(r, f ), ? < ?. Provided ? and ? are similar small
functions, we consider the zero distribution of L(z, f ) ? ?f
n ? ? for n ? 3 and n = 2, respectively. Our results are
improvements and complements of Chen [Abstract Appl Anal 2011 (2011):ID 239853), and Laine [J Math Anal Appl
469 (2019):808?826].