Electronic Journal of Differential Equations,
Vol. 2011 (2011), No. 125, pp. 1-14.

Title: Kwong-Wong-type integral equation on time scales

Author: Baoguo Jia (Zhongshan Univ., Guangzhou, China)

Abstract:
 Consider the second-order nonlinear dynamic equation
 $$
 [r(t)x^\Delta(\rho(t))]^\Delta+p(t)f(x(t))=0,
 $$
 where $p(t)$ is the backward jump operator.
 We obtain a Kwong-Wong-type integral equation, that is:
 If $x(t)$ is a nonoscillatory solution of the above equation
 on $[T_0,\infty)$, then the integral equation
 $$
 \frac{r^\sigma(t)x^\Delta(t)}{f(x^\sigma(t))}
 =P^\sigma(t)+\int^\infty_{\sigma(t)}\frac{r^\sigma(s)
 [\int^1_0f'(x_h(s))dh][x^\Delta(s)]^2}{f(x(s))
 f(x^\sigma(s))}\Delta s
 $$
 is satisfied for $t\geq T_0$, where
 $P^\sigma(t)=\int^\infty_{\sigma(t)}p(s)\Delta s$, and
 $x_h(s)=x(s)+h\mu(s)x^\Delta(s)$.
 As an application, we show that the superlinear dynamic equation
 $$
 [r(t)x^{\Delta}(\rho(t))]^\Delta+p(t)f(x(t))=0,
 $$
 is oscillatory, under certain conditions.

Submitted July 21, 2011. Published September 29, 2011.
Math Subject Classifications: 34K11, 39A10, 39A99.
Key Words: Nonlinear dynamic equation; integral equation;
           nonoscillatory solution.