Nonlocal Boundary Value Problem for Impulsive Differential Equations of Fractional Order
© Liu Yang and Haibo Chen. 2011
Received: 18 September 2010
Accepted: 4 January 2011
Published: 17 January 2011
We study a nonlocal boundary value problem of impulsive fractional differential equations. By means of a fixed point theorem due to O'Regan, we establish sufficient conditions for the existence of at least one solution of the problem. For the illustration of the main result, an example is given.
Fractional differential equations arise in many engineering and scientific disciplines as the mathematical modeling of systems and processes in various fields, such as physics, mechanics, aerodynamics, chemistry, and engineering and biological sciences, involves derivatives of fractional order. Fractional differential equations also provide an excellent tool for the description of memory and hereditary properties of many materials and processes. In consequence, fractional differential equations have emerged as a significant development in recent years, see [1–3].
Ahmad and Sivasundaram  studied a class of four-point nonlocal boundary value problem of nonlinear integrodifferential equations of fractional order by applying some fixed point theorems.
To the best of our knowledge, this is the first time in the literatures that a nonlocal boundary value problem of impulsive differential equations of fractional order is considered. In addition, the nonlinear term involves . Evidently, problem (1.5) not only includes boundary value problems mentioned above but also extends them to a much wider case. Our main tools are the fixed point theorem of O'Regan. Some recent results in the literatures are generalized and significantly improved (see Remark 3.6)
The organization of this paper is as follows. In Section 2, we will give some lemmas which are essential to prove our main results. In Section 3, main results are given, and an example is presented to illustrate our main results.
At first, we present here the necessary definitions for fractional calculus theory. These definitions and properties can be found in recent literature.
Second, we define
Like the definition 2.1 in , we give the following definition.
To deal with problem (1.5), we first consider the associated linear problem and give its solution.
Now, we introduce the fixed point theorem which was established by O'Regan in . This theorem will be applied to prove our main results in the next section.
Denote by an open set in a closed, convex set of a Banach space . Assume that . Also assume that is bounded and that is given by , in which is continuous and completely continuous and is a nonlinear contraction (i.e., there exists a nonnegative nondecreasing function satisfying for , such that for all ), then either
3. Main Results
Now, we make the following hypotheses.
Now, we state our main results.
The proof will be given in several steps.
Taking into account the uniform continuity of the function on , we get that is equicontinuity on . By the Lemma 5.4.1 in , we have as relatively compact. Due to the continuity of , , , it is clear that is continuous. Hence, we complete the proof of Step 1.
Next, we will give some corollaries.
Compared with Theorem 3.2 in , Corollary 3.5 does not need conditions , and . Moreover, we only need .
where . Here, , , . Let and , then we can see that holds. Choosing , , we can easily obtain that holds. Let , then we have that also holds. Moreover, , . Hence, we get for any given . Therefore, By Theorem 3.1, the above problem (3.13) has at least one solution for .
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