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Abstract
We study about solutions of certain kind of non-linear differential difference equations and where , are integers, are non-zero constants satisfying , is a polynomial and Q is a non-constant polynomial.
In this paper, we mainly investigate entire solutions of the following two non-linear differential-difference equations [see formula in PDF] and [see formula in PDF][see formula in PDF], where [see formula in PDF] is an integer, [see formula in PDF] are non-zero constants, [see formula in PDF] is a non-vanishing polynomial and [see formula in PDF] is a non-constant polynomial. Under some additional hypotheses, we analyze the existence and expressions of transcendental entire solutions of the above equations.
In this paper, we describe entire solutions for two certain types of non-linear differential-difference equations of the form and where q, Q, u, v are non-constant polynomials, are non-zero constants, and is a constant. Our results improve and generalize some previous results.
Recently, C.-.C. Yang and I. Laine have investigated finite order entire solutions f of nonlinear differential-difference equations of the form f
n
+ L(z, f) = h, where n ≥ 2 is an integer. In particular, it is known that the equation f(z)2 +q(z)f(z +1) = p(z), where p(z),q(z) are polynomials, has no transcendental entire solutions of finite order. Assuming that Q(z) is also a polynomial and c ∈ ℂ, equations of the form f(z)n
+q(z)eQ(z)f(z +c) = p(z) do posses finite order entire solutions. A classification of these solutions in terms of growth and zero distribution will be given. In particular, it is shown that any exponential polynomial solution must reduce to a rather specific form. This reasoning relies on an earlier paper due to N. Steinmetz.
We investigate the growth of the Nevanlinna Characteristic of f(z+\eta)
for a fixed \eta in this paper. In particular, we obtain a precise
asymptotic relation between T(r,f(z+\eta) and T(r,f), which is only true
for finite order meromorphic functions. We have also obtained the
proximity function and pointwise estimates of f(z+\eta)/f(z) which is a
version of discrete analogue of the logarithmic derivative of f(z). We
apply these results to give growth estimates of meromorphic solutions to
higher order linear difference equations. This also solves an old
problem of Whittaker concerning a first order difference equation. We
show by giving a number of examples that all these results are best
possible in certain senses. Finally, we give a direct proof of a result
by Ablowitz, Halburd and Herbst.
In this paper, we point out some similarities between results on the existence and uniqueness of finite order entire solutions of the nonlinear differential equations and differential-difference equations of the form
Here n is an integer , h is a given non-vanishing meromorphic function of finite order, and L(z,f) is a linear differential-difference polynomial, with small meromorphic functions as the coefficients.
1 Basic Nevanlinna theory.- 2 Unicity of functions of finite (lower) order.- 3 Five-value, multiple value and uniqueness.- 4 The four-value theorem.- 5 Functions sharing three common values.- 6 Three-value sets of meromorphic functions.- 7 Functions sharing one or two values.- 8 Functions sharing values with their derivatives.- 9 Two functions whose derivatives share values.- 10 Meromorphic functions sharing sets.
By utilizing Nevanlinna's value distribution theory of meromorphic functions, we solve the transcendental entire solutions of the following type of nonlinear differential equations in the complex plane: f(n)(z) + P(f) = p(2)e(alpha 2z), where p(1) and p(2) are two small functions of e(z), and alpha(1), alpha(2) are two nonzero constants with some additional conditions, and P(f) denotes a differential polynomial in f and its derivatives (with small functions of f as the coefficients) of degree no greater than n - 1.
By utilizing Nevanlinna's value distribution theory of meromorphic functions, it is shown that the following type of nonlinear differential equations:fn(z)+Pn−3(f)=p1eα1z+p2eα2z has no nonconstant entire solutions, where n is an integer ⩾4, p1 and p2 are two polynomials (≢0), α1, α2 are two nonzero constants with α1/α2≠ rational number, and Pn−3(f) denotes a differential polynomial in f and its derivatives (with polynomials in z as the coefficients) of degree no greater than n−3. It is conjectured that the conclusion remains to be valid when Pn−3(f) is replaced by Pn−1(f) or Pn−2(f).
Expressions of meromorphic solutions of a certain type of nonlinear complex differential equations
Jan 2020
B KOREAN MATH SOC
1061-1073
J F Chen
G Lian
Chen, J.F., Lian, G. (2020). Expressions of meromorphic solutions of a certain type of nonlinear
complex differential equations. Bulletin of the Korean Mathematical Society, 57(4), 1061-1073.
Value Distribution Theory, Translated and revised from the 1982 Chinese Original
Jan 1993
Yang Lo
Yang Lo, Value Distribution Theory, Translated and revised from the 1982 Chinese Original,
Springer-Verlag, Berlin (1993).