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Abstract and Applied Analysis
Volume 2014 (2014), Article ID 925010, 9 pages
Positive Solutions for the Eigenvalue Problem of Semipositone Fractional Order Differential Equation with Multipoint Boundary Conditions
Department of Basic Teaching, Shanghai Jianqiao College, Shanghai 201319, China
Received 17 January 2014; Accepted 14 February 2014; Published 15 April 2014
Academic Editor: Xinguang Zhang
Copyright © 2014 Ge Dong. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
We study the existence of positive solution for the eigenvalue problem of semipositone fractional order differential equation with multipoint boundary conditions by using known Krasnosel'skii's fixed point theorem. Some sufficient conditions that guarantee the existence of at least one positive solution for eigenvalues sufficiently small and sufficiently large are established.
In this paper, we study the existence of positive solutions to the following eigenvalue problem of semipositone fractional order differential equation with multipoint boundary conditions: where , , , with , is a positive parameter, and are the standard Rieman-Liouville derivative. Throughout the paper, we assume that is semipositone; that is, is continuous and there exists , such that , for any .
The multipoint boundary value problems (BVPs for short) for ordinary differential equations arise in a variety of different applied mathematics and physics. Recently, Feng and Bai  investigated the existence of positive solutions for a semipositone second-order multipoint boundary value problem: By using Krasnosel'skii's fixed point theorem, some sufficient conditions that guarantee the existence of at least one positive solution are obtained. In , a -type conjugate boundary value problem for the nonlinear fractional differential equation, is considered. Based on the nonlinear alternative of Leray-Schauder type and Krasnosel'skii's fixed-point theorems, the existence of positive solution of the semipositone boundary value problems (3) for a sufficiently small was given. In recent paper , Zhang et al. established the existence of multiple positive solutions for a general higher order fractional differential equation with derivatives and a negatively Carathèodory perturbed term: Some local and nonlocal growth conditions were adopted to guarantee the existence of at least two positive solutions for the higher order fractional differential equation (4). For the recent work in application, the reader is referred to [4–20].
Inspired by the above work, in this paper we study the existence of positive solutions to the semipositone BVP (1). Here we also emphasize that the main results of this paper contain not only the cases for sufficiently small, but also for sufficiently large, which is different from [2, 3].
2. Preliminaries and Lemmas
Definition 2 (see [21–24]). The Riemann-Liouville fractional derivative of order of a function : is given by where , denotes the integer part of the number , and , provided that the right-hand side is defined on .
Lemma 6. The following boundary value problem has a unique solution , which satisfies
The basic space used in this paper is , where is the set of real numbers. Obviously, the space is a Banach space if it is endowed with the norm as follows: for any . Let and then is a cone of .
Now let ; then the boundary value problem (1) is equivalent to the following boundary value problem: Define a modified function for any by and consider
Proof. Since is a positive solution of the BVP (22) such that for any , we have Let , and then we have Substitute (24) into (23), that is (20), which implies that is a positive solution of the BVP (1).
Lemma 8. is a completely continuous operator.
Proof. For any fixed , there exists a constant such that , and
This implies that the operator is bounded.
Next for any , by Lemma 5, we have On the other hand, it follows from Lemma 5, , and that So, by (30) and (31), we have which yields that .
At the end, using standard arguments, according to the Ascoli-Arzela Theorem, one can show that is completely continuous. Thus is a completely continuous operator.
Lemma 9 (see ). Let be a real Banach space, and let be a cone. Assume that are two bounded open subsets of with , and let be a completely continuous operator such that either(1) and , or(2) and .Then has a fixed point in .
3. Main Result
Theorem 10. Suppose that Then there exists a constant such that, for any , the BVP (1) has at least one positive solution.
Proof. Choosing with , then
For any , , and sufficiently small such that , we have
On the other hand, take and choose a large enough such that By (33), we know that is an unbounded continuous function. Therefore, for any , there exists a constant such that Choosing then . Let . Then for any and for any , we have Consequently, for , it follows from (43) that and then by (41) and (44), for , we get
So for any and , by (45), we have Thus, we have By Lemma 9, has a fixed point such that .
From we have Thus By Lemma 7 and (50), the boundary value problem (1) has at least one positive solution. The proof of Theorem 10 is completed.
Theorem 11. Suppose that and there exist constants and such that Then there exists a constant such that, for any , the BVP (1) has at least one positive solution.
and let . Then for any ,, and , we have
so for any and , by (52)–(55), we have
Thus, we have
According to (51), it is clear that Let us choose such that Then there exists a large enough such that Thus, by (60), if then
Now denote that and choose Then .
Next let . Then for any and for any , we have which implies that By Lemma 9, has at least a fixed points such that .
It follows from that By Lemma 7 and (67), the boundary value problem (1) has at least one positive solution. The proof of Theorem 11 is completed.
Conflict of Interests
The author declares that there is no conflict of interests regarding the publication of this paper.
The authors were supported financially by “Chen Guang” Project supported by Shanghai Municipal Education Development Foundation (10CGB25) and Shanghai Universities for Outstanding Young Teachers Scientific Research Selection and Training Special Fund (sjq08011).
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