Existence of Positive Solution to Second-Order Three-Point BVPs on Time Scales
© Jian-Ping Sun 2009
Received: 19 April 2009
Accepted: 14 September 2009
Published: 28 September 2009
We are concerned with the following nonlinear second-order three-point boundary value problem on time scales , , , , where with and . A new representation of Green's function for the corresponding linear boundary value problem is obtained and some existence criteria of at least one positive solution for the above nonlinear boundary value problem are established by using the iterative method.
Let be a time scale, that is, is an arbitrary nonempty closed subset of . For each interval of we define For more details on time scales, one can refer to [1–5]. Recently, three-point boundary value problems (BVPs for short) for second-order dynamic equations on time scales have received much attention. For example, in 2002, Anderson  studied the following second-order three-point BVP on time scales:
where , , and . Some existence results of at least one positive solution and of at least three positive solutions were established by using the well-known Krasnoselskii and Leggett-Williams fixed point theorems. In 2003, Kaufmann  applied the Krasnoselskii fixed point theorem to obtain the existence of multiple positive solutions to the BVP (1.1). For some other related results, one can refer to [8–10] and references therein.
In this paper, we are concerned with the existence of at least one positive solution for the following second-order three-point BVP on time scales:
Throughout this paper, we always assume that with , , and
It is interesting that the method used in this paper is completely different from that in [6, 7, 9, 10], that is, a new representation of Green's function for the corresponding linear BVP is obtained and some existence criteria of at least one positive solution to the BVP (1.2) are established by using the iterative method.
For the function , we impose the following hypotheses:
(H1) is continuous;
(H2)for fixed , is monotone increasing on ;
2. Main Results
On the other hand, if satisfies (2.1), then it is easy to verify that is a solution of the BVP (1.2).
we know that (2.9) is fulfilled.
Our main result is the following theorem.
Then it is obvious that fixed points of the operator in are positive solutions of the BVP (1.2).
First, in view of (H2), it is easy to know that is increasing.
which shows that .
This work is supported by the National Natural Science Foundation of China (10801068).
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