Abstract
We study the differential equations w 2+R(z)(w (k))2 = Q(z), where R(z),Q(z) are nonzero rational functions. We prove
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(1)
if the differential equation w 2+R(z)(w′)2 = Q(z), where R(z), Q(z) are nonzero rational functions, admits a transcendental meromorphic solution f, then Q ≡ C (constant), the multiplicities of the zeros of R(z) are no greater than 2 and f(z) = √C cos α(z), where α(z) is a primitive of \(\tfrac{1} {{\sqrt {R(z)} }}\) such that √C cos α(z) is a transcendental meromorphic function.
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(2)
if the differential equation w 2 + R(z)(w (k))2 = Q(z), where k ⩾ 2 is an integer and R,Q are nonzero rational functions, admits a transcendental meromorphic solution f, then k is an odd integer, Q ≡ C (constant), R(z) ≡ A (constant) and f(z) = √C cos (az + b), where \(a^{2k} = \tfrac{1} {A}\).
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Zhang, X., Liao, L. On a certain type of nonlinear differential equations admitting transcendental meromorphic solutions. Sci. China Math. 56, 2025–2034 (2013). https://doi.org/10.1007/s11425-013-4594-0
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DOI: https://doi.org/10.1007/s11425-013-4594-0
Keywords
- nonlinear differential equations
- linear differential equations
- Nevanlinna theory
- transcendental meromorphic solutions