±¨¸æÎÊÌ⣺Meromorphic solutions of higher order delay differential equations
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±¨¸æÕªÒª£ºWe study the higher order delay differential equations $$w(z + 1)?w(z?1) + a(z)w^{(k)}(z) w(z) = R(z, w(z)),$$ and $$w(z + 1) + a(z)w^{(k)}(z)w(z) = R(z, w(z)),$$ where $k$ is a positive integer, $a(z)$ is a rational function and $R(z, w)$ is rational in $w$ with rational coefficients. We obtain necessary conditions on the degree of $R(z, w)$ for these delay differential equations to admit a subnormal transcendental meromorphic solution. These results generalize some of the previous results by Halburd and Korhonen [Proceeding of AMS 2017] to higher order case. Some examples are given to support our conclusions. This is a joint work with Prof. Korhonen and Dr. Yu Chen.
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