Abstract
In this paper, we study the boundary value problems for a class of nonlinear fractional differential equations with impulsive and fractional integral boundary conditions. By means of standard fixed point theorems, some existence and uniqueness results are obtained. As applications, two examples are given to illustrate the results.
MSC:34A60, 26A33, 34B15.
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1 Introduction
The subject of fractional differential equations has evolved as an interesting and popular field of research. It is mainly due to the extensive applications of fractional calculus in the mathematical modeling of physical, engineering, and biological phenomena etc. [1–4]. For some developments on the theory of fractional differential equations, we can refer to [5–25] and the references therein.
Integral boundary conditions have various applications in applied fields such as blood flow problems, chemical engineering, thermo-elasticity, underground water flow, population dynamic, and so forth. Recently, there has been a great deal of research on the questions of existence and uniqueness of solutions for boundary value problems of fractional differential equations with integral boundary conditions. For example, Ahmad et al. [8] investigated the existence and uniqueness of solutions for a boundary value problem of nonlinear fractional differential equations with three-point integral boundary conditions given by
where denotes the Caputo fractional derivative of order α, f is a given continuous function, and with .
In [13], Guezane-Lakoud and Khaldi discussed the fractional differential equations with fractional integral boundary conditions as the following form:
where denotes the Caputo fractional derivative of order q, the Riemann-Liouville fractional integral of order β, f is a given continuous function.
For the case of nonlinear impulsive fractional differential equations with integral boundary conditions, Ahmad and Sivasundaram [9] studied the existence of solutions for the following equation:
where denotes the Caputo fractional derivative of order , , , , with , , , has a similar meaning for , and , .
Motivated by the above mentioned papers, in this article, we will consider the following impulsive problem:
where denotes the Caputo fractional derivative of order , the Riemann-Liouville fractional integral of order γ, , , , , with , representing the right and left limits of at , has a similar meaning for , a, b, c are real constants and .
The paper is organized as follows: in Section 2 we present the notations, definitions and give some preliminary results that we need in the sequel, Section 3 is dedicated to the existence results of problem (1), in the final Section 4, two examples are given to illustrate the results.
2 Preliminaries
Definition 2.1 The Riemann-Liouville fractional integral of order q for a function is defined as
provided the integral exists.
Definition 2.2 For a function , the Caputo derivative of fractional order q is defined as
where denotes the integer part of the real number q.
Lemma 2.1 ([23])
Let , then the differential equation
has solutions and
where , , .
For the sake of convenience, we introduce the following notation.
Let , , …, , , , and = {, , and exist, , and }. Obviously, is a Banach space with the norm .
Lemma 2.2 For any , the unique solution of the impulsive boundary value problem
is given by
where
Proof For , by Lemma 2.1, we know that a general solution of the equation on each interval () is given by
where are arbitrary constants.
Since , ,
we have , . By using the impulsive conditions in (2), we obtain, for ,
Now we can derive the values of , ,
for and
Hence for , we have
This completes the proof. □
The following are two fixed point theorems which will be used in the sequel.
Theorem 2.1 (Nonlinear alternative of Leray-Schauder type [26])
Let X be a Banach space, C a nonempty convex subset of X, U a nonempty open subset of C with . Suppose that is a continuous and compact map. Then either (a) P has a fixed point in , or (b) there exist a (the boundary of U) and with .
Theorem 2.2 (Schaefer fixed point theorem [26])
Let X be a normed space, P a continuous mapping of X into X which is compact on each bounded subset B of X. Then either (1) the equation has a solution for , or (2) the set of all such solutions x is unbounded for .
3 Main results
This section deals with the existence and uniqueness of solutions for problem (1). In view of Lemma 2.2, we define an operator by
with
Here , mean that Λ, W defined in Lemma 2.2 are related to . It is obvious that F is well defined because of the continuity of f, and . Observe that problem (1) has solutions if and only if the operator F has fixed points.
Let be the essentially bounded function space from J to and an element of , we denote the sup-norm of m by . Now, we are in a position to present our main results.
Theorem 3.1 Assume that there exist and positive constants L, such that, for , , ,
Moreover,
Then BVP (1) has a unique solution on J.
Proof Denote and . For any and each , we have
Since
and
we can deduce that
Therefore, by (7), the operator F is a contraction mapping on . Then it follows from Banach’s fixed point theorem that problem (1) has a unique solution on J. This completes the proof. □
Lemma 3.1 The operator defined by (4) is completely continuous.
Proof Since f, and are continuous, it is easy to show that F is continuous on .
Let be bounded, then there exist three positive constants , , such that , and for all , , . Thus, for and , we have
This means that for all and ,
which shows that the operator F is uniformly bounded on B.
On the other hand, let and for any , , with , we have
By (8), (9), and the above inequality, we can deduce that
This implies that F is equicontinuous on the interval . Hence by PC-type Arzela-Ascoli Theorem (see [27]), the operator is completely continuous. □
Theorem 3.2 Assume that: (a) there exist and continuous, nondecreasing such that for ; (b) there exist continuous, nondecreasing such that , for all and ; (c) there exists a constant such that
where
Then BVP (1) has at least one solution.
Proof We will show that the operator F defined by (4) satisfies the assumptions of the nonlinear alternative of Leray-Schauder type.
By Lemma 3.1, we know that the operator is continuous and completely continuous.
Let be such that for some . Then using the computations in proving that F maps bounded sets into bounded sets in Lemma 3.1, we obtain
Consequently, we have
Then in view of condition (10), there exists M such that . Let us set
The operator is continuous and compact. From the choice of the set U, there is no such that for some . Therefore by the nonlinear alternative of Leray-Schauder type, we deduce that F has a fixed point x in which is a solution of the problem (1). The proof is completed. □
Theorem 3.3 Assume that there exist and positive constants , such that, for , , ,
Then the BVP (1) has at least one solution on J.
Proof Lemma 3.1 tells us that the operator defined by (4) is continuous and compact on each bounded subset B of .
Now, we show that the set is bounded. Let , then for some . For each , by using a discussion similar to the one in Theorem 3.2, we have
This implies that there exists some such that for all , i.e. V is bounded. Thus, by Theorem 2.2, the operator F has at least one fixed point. Hence the problem (1) has at least one solution. The proof is completed. □
4 Examples
In this section, we give two examples to illustrate the main results.
Example 1 Consider the boundary value problem
Here , , and . Clearly, we can take , and such that the relations (5) and (6) hold. Moreover,
Thus, all the assumptions of Theorem 3.1 are satisfied. Hence, by the conclusion of Theorem 3.1, the impulsive fractional BVP (11) has a unique solution on .
Example 2 Consider the following fractional differential equation:
In the context of this problem, we have
Put , and . Then from Theorem 3.3, the impulsive fractional BVP (12) has at least one solution on .
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Acknowledgements
The authors would like to thank the reviewers for their valuable comments and suggestions on the paper. This research was supported by Zhejiang Provincial Natural Science Foundation of China under Grant No. (Q14A010012).
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Fu, X., Bao, X. Some existence results for nonlinear fractional differential equations with impulsive and fractional integral boundary conditions. Adv Differ Equ 2014, 129 (2014). https://doi.org/10.1186/1687-1847-2014-129
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DOI: https://doi.org/10.1186/1687-1847-2014-129