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Nonlocal boundary value problems of fractional order at resonance with integral conditions
Advances in Difference Equations volume 2017, Article number: 326 (2017)
Abstract
Based upon the wellknown coincidence degree theory of Mawhin, we obtain some new existence results for a class of nonlocal fractional boundary value problems at resonance given by
where α, β are real numbers with \(2<\alpha\leq3\), \(0<\beta\leq1\), \(D_{0+}^{\alpha}\) and \(I_{0+}^{\alpha}\) respectively denote RiemannLiouville derivative and integral of order α, \(f:[0,1]\times\mathbb{R}^{3}\rightarrow\mathbb{R}\) satisfies the Carathéodory conditions, \(\int_{0}^{1}D_{0+}^{\beta}u(t)\,dA(t)\) is a RiemannStieltjes integral with \(\int_{0}^{1}t^{\alpha\beta1}\,dA(t)=1\). We also present an example to demonstrate the application of the main results.
1 Introduction
In recent years, fractional calculus theory has become a popular area of investigation in view of its widespread applications. Furthermore, fractional differential equation, as a branch of fractional calculus, has been a hot area of research of differential equation with not only numerous theoretical developments, but also countless applications to practical problems. For example, in order to describe certain problems raised in science and engineering, the fractional differential equation is superior to the classical integer one, especially in the fields of biology, physics, mechanics, ecological engineering, finance and other fields which propose the process of memory and genetic properties. For more details about fractional differential equations, one can see [1–4].
In the past few years, fractional differential equations have attracted a considerable attention because of their extensive applications in realistic modeling. Consequently, a variety of excellent results on fractional boundary value problems (abbreviated BVPs) with resonant conditions have been achieved. For instance, we recommend [5–13] to the readers and the references therein. It is worth mentioning that Bai [7] studied a type of fractional differential equations with mpoints boundary conditions (abbreviated BCs)
where \(1<\alpha\leq2\). The existence of nontrivial solutions was established by using coincidence degree theory. Applying the same method, Kosmatov [10] investigated the fractional order three points BVP with resonant case
where \(1<\alpha\leq2\), \(0<\xi<1\).
Although the study of fractional BVPs at resonance has acquired fruitful achievements, it should be noted that such problems with RiemannStieltjes integrals are very scarce, so it is worthy of further explorations. RiemannStieltjes integral has been considered as both multipoint and integral in a single framework, which is more common, see the relevant works due to Ahmad et al. [14–16]. For more details on RiemannStieltjes integral and its significance, we refer the reader to the papers by Webb and Infante [17–19] and their other related works. Inspired greatly by the excellent literature mentioned above, in [20], we investigated a fractional differential equation \(D_{0+}^{\alpha}u(t)=f(t,u(t))\) with RiemannStieltjes integral \(u(0)=u' ( 0 ) =0\), \(D_{0+}^{\beta}u(1)= \int_{0}^{1}D_{0+}^{\beta}u(t)\,dA(t)\). By utilizing the monotone iterative method, the sufficient conditions which guarantee the existence of solutions were established. Promoted by [7] and [10], we would change the problem in [20] to make it more complicated so that it could describe more general practical engineering problems. Therefore, we will discuss the following BVP at resonance:
among them, α, β are real numbers with \(2<\alpha\leq3\), \(0<\beta\leq1\), \(D_{0+}^{\alpha}\) and \(I_{0+}^{\alpha}\) are the RiemannLiouville differentiation and integration criteria, respectively. \(f : [0, 1]\times\mathbb{R}^{3} \rightarrow\mathbb{R}\) satisfies the Carathéodory conditions, \(\int_{0}^{1}D_{0+}^{ \beta}u(t)\,dA(t)\) is a RiemannStieltjes integral that satisfies \(\int_{0}^{1}t^{\alpha\beta1}\,dA(t)=1\). We wish to pursue some new existence results in this paper by means of the coincidence degree theory of Mawhin. The consequences are fresh and BVP (1.3) is too, so far as we are concerned with researching it for the first time.
For the sake of readers, we will concisely list some necessary symbols now.
Have Y, Z to be real Banach spaces and \(L:\operatorname {dom}(L)\subset Y\rightarrow Z\) be a Fredholm mapping satisfied with index zero. Define \(P:Y\rightarrow Y\), \(Q:Z\rightarrow Z\) to be continuous projectors with
and the isomorphism
is reversible. The reversibility of \(L_{\operatorname {dom}(L)\cap \operatorname {Ker}(P)}\) is denoted by \(K_{P}:\operatorname {Im}(L) \rightarrow \operatorname {dom}(L)\cap \operatorname {Ker}(P)\). Let Ω be an open bounded subset of Y so that \(\operatorname {dom}(L)\cap\Omega\neq \mathbf{\emptyset}\). The mapping \(N:Y\rightarrow Z\) is called Lcompact on Ω̅ if \(QN(\overline{\Omega})\) and \(K_{P}(I  Q):\overline{\Omega}\rightarrow Y\) are continuous and compact on Ω̅.
The proof of our major results will be shown by employing the coincidence degree theory of Mawhin [21], which plays an extremely important role in investigating the existence of various types of resonant problems. Now, we present it here.
Theorem 1.1
([21])
Let L be a Fredholm operator of index zero and N be Lcompact on the set Ω. Suppose that the following three conditions are satisfied:

(i)
\(Lx\neq\lambda Nx\) for each \((x,\lambda)\in[(\operatorname {dom}(L)\backslash \operatorname {Ker}(L))\cap\partial\Omega]\times(0,1)\);

(ii)
\(Nx\notin \operatorname {Im}(L)\) for each \(x\in \operatorname {Ker}(L)\cap\partial \Omega\);

(iii)
\(\operatorname {deg}(JQN_{\operatorname {Ker}(L)} ,\operatorname {Ker}(L) \cap\Omega,\theta)\neq0\), where \(Q:Z \rightarrow Z\) is a projection as above with \(\operatorname {Im}(L) = \operatorname {Ker}(Q)\) and \(J:\operatorname {Im}(Q)\rightarrow \operatorname {Ker}(L)\) is any isomorphism.
Then the operator equation \(Lx=Nx\) has at least one solution in \(\operatorname {dom}(L)\cap\overline{\Omega}\).
The remainder of the thesis is organized as follows. Firstly, we list several necessary definitions and lemmas. Secondly, we obtain the solvability for BVP (1.3). Finally, an example is also given to elucidate the major results.
2 Preliminary lemmas
Let \(C[0, 1]\) and \(L^{1}[0,1]\) be matched with \(\Vert u\Vert _{\infty}= \max_{t\in [ 0,1 ] } \vert u(t)\vert \) and \(\Vert u\Vert _{1} = \int_{0}^{1}\vert u(t)\vert \,dt\) as their own norms, respectively. Then they are both Banach spaces. For any \(n \in N\), have \(\mathit {AC}^{n}[0, 1]\) to be the space consisting of all functions \(u(t)\) with continuous derivatives until \(n1\) order on a closed interval \([0, 1]\) such that \(u^{n1}(t)\) is absolutely continuous, which we denote
Lemma 2.1
([20])
Assume that the function \(y\in C(0,1)\cap L^{1}[0,1]\) and α, β are positive constants satisfying \(\alpha\beta \geq0\). Then
Now, we present some conclusions owing to Bai [7], which are basal throughout the paper.
Definition 2.2
([7])
Given \(\mu>0\) and \(N=[\mu]+1\), define a linear space as
where \(C_{i}\in\mathbb{R}\), \(i=1,2,\ldots,N1\).
Remark 2.3
([7])
Built upon functional analysis theory, it follows that \(C^{\mu}[0, 1]\) is a Banach space endowed with \(\Vert u(t)\Vert _{C^{\mu}}= \Vert D_{0+}^{\mu}u \Vert _{\infty}+\cdots+\Vert D_{0+}^{\mu(N1)}u\Vert _{\infty }+\Vert u\Vert _{\infty}\) as its norm.
Lemma 2.4
([7])
\(F\in C^{\mu}[0, 1]\) is sequentially compact when it satisfies the characteristics of uniform boundedness and equicontinuity. Here, uniformly bounded connotes that there exists \(M > 0\) such that, for every \(x\in F\),
and equicontinuous connotes that for any \(\varepsilon> 0\), there always exists \(\delta> 0\) so that
and
3 Main results
Suppose that the following assumptions hold throughout this paper:

(a)
\(2<\alpha\leq3\), \(0<\beta\leq1\) are real numbers;

(b)
\(\int_{0}^{1}t^{\alpha\beta1}\,dA(t)=1\).
Let \(Z=L^{1}[0,1]\) endued with \(\Vert z\Vert _{1}=\int _{0}^{1}\vert z(t)\vert \,dt\) as its norm. Y can be expressed as
and equipped with the weighted norm \(\Vert u\Vert =\Vert D_{0+}^{\alpha1}u\Vert _{\infty}+\Vert D_{0+}^{\alpha2}u\Vert _{\infty}+\Vert u\Vert _{\infty}\), where \(\Vert u\Vert _{\infty}:=\sup_{0\leq t\leq1}\vert u(t)\vert \).
Define \(L:\operatorname {dom}(L)\cap Z\) to be the linear operator by
and in which
Define the operator \(N:Y\rightarrow Z\) by the formula
Thus BVP (1.3) transforms to an equivalent operator equation
Denote
Lemma 3.1
Let L be delimitated as formula (3.1), then we obtain
and
Proof
Direct calculation shows that \(D_{0+}^{\alpha}u(t)=0\) has the solution as
Due to the BCs \(I_{0^{+}}^{3\alpha}u ( 0 ) =u'(0)=0\), we get \(C_{2}=C_{3}=0\). Moreover, \(D_{0+}^{\beta}u(1)= \int_{0}^{1}D_{0+} ^{\beta}u(s)\,dA(s)\) together with \(\int_{0}^{1}t^{\alpha\beta1}\,dA(t)=1\) yields that (3.2) is satisfied.
Let \(y\in Z\) and
In line with Lemma 2.1, we receive
Substituting the conditions \(D_{0+}^{\beta}u(1)=\int_{0}^{1}D_{0+} ^{\beta}u(t)\,dA(t)\) and \(\int_{0}^{1}t^{\alpha\beta1}\,dA(t)=1\),
is available, then we have evidently that
Consequently, we arrive at (3.3).
Let \(u(t)=I_{0^{+}}^{\alpha}y(t)\), then \(u\in \operatorname {dom}(L)\) and \(D_{0+} ^{\alpha}u(t)=y(t)\). Therefore, \(y\in \operatorname {Im}(L)\). □
Lemma 3.2
The mapping \(L : \operatorname {dom}(L)\cap Y \rightarrow Z\) is an index zero Fredholm operator.
Proof
Define a subsidiary operator \(Q:Z\rightarrow R\) by
then
the above formula shows that \(Q:Z\rightarrow Z\) is an idempotent mapping.
Observing that \(y\in \operatorname {Im}(L)\), we can get \(Qy=\theta\), and then \(y\in \operatorname {Ker}(L)\). Otherwise, if \(y\in \operatorname {Ker}(Q)\), we may get that \(Qy=\theta\), i.e., \(y\in \operatorname {Im}(L)\). So, \(\operatorname {Ker}(Q)=\operatorname {Im}(L)\).
Denote \(y \in Z\) in the way of \(y = (y Qy)+Qy\) so that \(y \in Z\), \(Qy \in \operatorname {Im}(L) = \operatorname {Ker}(Q)\) and \(Qy\in \operatorname {Im}(Q)\). Thereby, \(Z = \operatorname {Im}(L)+\operatorname {Im}(Q)\). In addition, make \(y_{0}\in \operatorname {Im}(L)\cap \operatorname {Im}(Q)\) and suppose that \(y_{0}(s) = c\) is not identically zero on \([0, 1]\). Afterwards, because of \(y_{0} \in \operatorname {Im}(L)\), we get \(Q(y_{0})=Q(c)=cQ(1)=0\) by (3.4) and then derive \(c= 0\), which is contradictory. Whereupon, \(\operatorname {Im}(L)\cap \operatorname {Im}(Q) = {0}\); thus \(Z = \operatorname {Im}(L)\oplus \operatorname {Im}(Q)\). Note that \(\dim \operatorname {Ker}(L) = 1 = \operatorname {co}\dim \operatorname {Im}(L)\), that is, L is a Fredholm operator of index zero. □
Make \(P : Y\rightarrow Y\) be defined by
Minding that P is a linear continuous mapping and \(\operatorname {Ker}(P)=\{u\in Y\mid u=D _{0+}^{\alpha1}u(0)=0\}\), it is easy to get the fact \(Y = \operatorname {Ker}(L) \oplus \operatorname {Ker}(P)\).
Delimitating \(K_{P} : \operatorname {Im}(L) \rightarrow \operatorname {dom}(L) \cap \operatorname {Ker}(P)\) by
In fact, for \(g \in \operatorname {Im}(L)\), \((LK_{P} )g = g\). At the same time, if \(u \in \operatorname {dom}(L)\cap \operatorname {Ker}(P)\), then
and based on the BCs of BVP (1.3), we can get that \(C_{2} = C_{3} = 0\). On the basis of the fact that \(g\in \operatorname {dom}(L)\), we derive
which shows that \(C_{1} = 0\). Hence \(K_{P} = (L_{\operatorname {dom}(L)\cap \operatorname {Ker}(P)})^{1}\).
Lemma 3.3
Let \(\eta=\frac{3}{2}+\frac{1}{\Gamma(\alpha+1)}\). Then
for any \(y\in \operatorname {Im}(L)\).
Proof
For each \(y\in \operatorname {Im}(L)\) and \(t\in[0,1]\), there is
□
Lemma 3.4
Assume that \(f:[0,1]\times\mathbb{R}^{3}\rightarrow\mathbb{R}\) meeting the Carathéodory conditions, then \(K_{P}(IQ)N : Y \rightarrow Y\) is a completely continuous operator.
Proof
It is manifested that \(K_{P}\) is compact by way of Remark 2.3 and Lemma 2.4. Due to the continuity of \(K_{P}\), \(IQ\) and the boundedness of N, the conclusion can be made that this lemma holds. □
Theorem 3.5
Let \(f : [0, 1]\times\mathbb{R}^{3} \rightarrow\mathbb{R}\) meeting the Carathéodory conditions. We impose the following conditions:
 \((H_{1})\) :

There exist four functions a, b, c, r which are continuous on \([0,1]\) such that for all \((x, y, z)\in\mathbb{R}^{3}\),
$$ \bigl\vert f(t,x,y,z)\bigr\vert \leq a(t)\vert x\vert + b(t)\vert y \vert + c(t)\vert z\vert + r(t), \quad t\in[0,1]; $$  \((H_{2})\) :

There exists a constant \(M > 0\) such that for \(u \in \operatorname {dom}(L)\), if \(\vert D_{0+}^{\alpha1}u(t)\vert > M\) for all \(t \in [0, 1]\), then
$$ \int_{0}^{1} \biggl( \int_{0}^{1}G(t,s)f\bigl(s,u(s),D_{0+}^{\alpha1}u(s),D _{0+}^{\alpha2}u(s)\bigr)\,ds \biggr) \,dA(t)\neq0; $$  \((H_{3})\) :

There exists \(M^{*} > 0\) such that for any \(c \in \mathbb{R}\), if \(\vert c\vert > M^{*}\), afterwards either
$$ c \int_{0}^{1} \biggl( \int_{0}^{1}G(t,s)f\bigl(s,cs^{\alpha1},c\Gamma( \alpha)s,c\Gamma(\alpha)\bigr)\,ds \biggr) \,dA(t)< 0; $$or else
$$ c \int_{0}^{1} \biggl( \int_{0}^{1}G(t,s)f\bigl(s,cs^{\alpha1},c\Gamma( \alpha)s,c\Gamma(\alpha)\bigr)\,ds \biggr) \,dA(t)> 0; $$  \((H_{4})\) :

\(0<\eta\eta_{1}<1\), where \(\eta_{1}=\int_{0}^{1}\vert a(t)\vert \,ds + \int_{0}^{1}\vert b(t)\vert \,ds+ \int_{0}^{1}\vert c(t)\vert \,ds\).
If hypotheses \((H_{1})\)\((H_{4})\) are satisfied, then BVP (1.3) has at least one solution in \(\operatorname {dom}(L)\).
Proof
Denote \(\eta_{2}=\int_{0}^{1}\vert r(s)\vert \,ds\).
Now, the proof will be divided into four steps.
The first step: Deploy \(\Omega_{1}= \{ u\in \operatorname {dom}(L) \operatorname {Ker}(L)\mid Lu= \lambda Nu,\lambda\in[0, 1] \} \) and prove \(\Omega_{1}\) to be a bounded set. Taking \(u\in\Omega_{1}\), then \(u\in \operatorname {dom}(L) \operatorname {Ker}(L)\) and \(Lu=\lambda Nu\), so \(\lambda\neq0\) and \(Nu\in \operatorname {Im}(L)=\operatorname {Ker}(Q)\subset Z\). Accordingly, \(Q(Nu)=\theta\). From \((H_{3})\), we have that \(\vert D_{0+} ^{\alpha1}u(0)\vert \leq M\).
Furthermore, for \(u\in\Omega_{1}\), we may arrive at
and
It can be seen based on the above discussion that
Under conditions \((H_{1})\) and \((H_{4})\), for each \(u\in\Omega_{1}\), there is
Then, in view of hypothesis \((H_{2})\) and the previous formulas (3.5) and (3.6), we may obtain that
which implies that \(\Omega_{1}\) is bounded.
The second step: Let \(\Omega_{2}=\{u\in \operatorname {Ker}(L)\mid Nu\in \operatorname {Im}(L)\}\). As for \(u\in\Omega_{2}\), whereat \(u\in \operatorname {Ker}(L)=\{u\in \operatorname {dom}(L)\mid u=ct^{\alpha1},c \in R,t\in[0,1]\}\) and \(Nu\in \operatorname {Im}(L)\), therefore
It follows from \((H_{2})\) that \(\vert c\vert \leq\frac {M}{\Gamma(\alpha)}\), so \(\Omega_{2}\) is bounded in Y.
The third step: Deploy \(\Omega^{(i)}_{3}=\{u\in \operatorname {Ker}(L)\mid (1)^{i} \lambda u+(1\lambda)JQNu=0,\lambda\in[0,1]\}\), \(i=1,2\), we figure out \(J:\operatorname {Im}(Q)\rightarrow \operatorname {Ker}(L)\) is a linear isomorphism operator given by \(J(c)=ct^{\alpha1}\). For every \(u(t)\in\Omega^{(1)}_{3}\), then \(u(t)=ct^{\alpha1}\),
so
When \(\lambda=1\), \(c=0\) is available. Elsewise, if \(\vert c\vert >M^{*}\), on the basis of the initial part of condition \((H_{3})\), we obtain
which contradicts \(\lambda c^{2}\geq0\). Thus this means we have verified that \(\Omega^{(1)}_{3}\in\{u\in \operatorname {Ker}(L)\mid u\in ct^{\alpha 1},\vert c\vert \leq M^{*}\}\) is a bounded set in Y.
Analogous to the above discussion, we may arrive at \(\Omega^{(2)}_{3}\) is bounded too.
The last step: Set Ω to be an open bounded set in Y so that \(\Omega\supset\Omega_{1}\cup\Omega_{2}\cup\Omega^{(i)}_{3}\), \(i=1,2\), and prove that
The operator N is Lcompact on Ω̅ according to the conclusion that \(QN(\overline{\Omega})\) is bounded and \(K_{P} (IQ)N : Y \rightarrow Y\) is completely continuous. Thus, with the first two steps, we may obtain

(i)
\(Lx\neq\lambda Nx\) for every \((x,\lambda)\in[(\operatorname {dom}(L) \operatorname {Ker}(L)) \cap\partial\Omega]\times(0,1)\);

(ii)
\(Nx\notin \operatorname {Im}(L)\) for every \(x\in \operatorname {Ker}(L)\cap\partial \Omega\).
Define \(H(u,\lambda)=(1)^{i}\lambda Iu+(1\lambda)JQNu\), \(i=1,2\), in which I is the identity mapping in X. In line with the discussions in the third step, we know that
and then, for \(i=1,2\), utilizing the degree property of invariance under a homotopy, we can arrive at
which certifies condition (iii) of Theorem 1.1.
In sum, all hypotheses of Theorem 1.1 are met. Thereby, BVP (1.3) has at least one solution in \(\operatorname {dom}(L)\cap\overline{\Omega}\). □
4 Example
In this section, an example is given to elucidate the accuracy of the main results.
Consider the BVP
where \(\alpha=\frac{5}{2}\), \(\beta=\frac{1}{2}\), \(A(t)=t\), and
and
Condition \((H_{1})\) holds obviously. We choose \(M=2\) and assume \(\vert D_{0+}^{\frac{3}{2}}u\vert >M\) holds for any \(t\in [0,1]\). On the one hand, if \(D_{0+}^{\frac{3}{2}}u(t)>M\) holds for any \(t\in[0,1]\), then
so
On the other hand, if \(D_{0+}^{\frac{3}{2}}u(t)<M\) holds for any \(t\in[0,1]\), then
so
Thus, condition \((H_{2})\) is established. Again, taking \(M^{*}=2\), for any \(c\in R\), if \(\vert c\vert >M^{*}\), we have
So, condition \((H_{3})\) is established. Consequently, by Theorem 3.5, BVP (4.1) has at least one positive solution.
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Acknowledgements
The thesis is funded by the Educational Science Research Project of Tangshan University (170322) and the Backbone teachers’ Cultivating Program of Tangshan University. The author would like to thank the anonymous referees very much for helpful comments and suggestions which led to the improvement of presentation and quality of the work.
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Zhang, HE. Nonlocal boundary value problems of fractional order at resonance with integral conditions. Adv Differ Equ 2017, 326 (2017). https://doi.org/10.1186/s1366201713798
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DOI: https://doi.org/10.1186/s1366201713798
MSC
 34B15
Keywords
 fractional differential equation
 resonance
 RiemannStieltjes integral
 coincidence degree theory