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Existence of solutions of non-autonomous fractional differential equations with integral impulse condition
Advances in Difference Equations volume 2020, Article number: 434 (2020)
Abstract
In this paper, we investigate the existence of solution of non-autonomous fractional differential equations with integral impulse condition by the measure of non-compactness (MNC), fixed point theorems, and k-set contraction. The obtained results are verified via a supporting example.
1 Introduction
Fractional calculus is a generalization of the standard integer calculus. The advantage of fractional calculus over integer-order calculus is that it provides a great deal for the kind of thought and hereditary characteristics of diversified materials and methods. From the past two decades, fractional calculus has attracted research attention towards itself due to its importance in several parts of science, like physics, fluid mechanics, heat conduction [1, 19, 21, 24, 26, 27, 32, 33, 37–42]. We can relate to the monographs [2, 22, 30, 36] for the fundamentals and to [4, 44, 45] for the current developments in the field of fractional calculus.
In recent years, non-autonomous differential equations of integer order, as well as fractional order, have been studied by many researchers. One can see the references [5–8, 10–13, 15–17, 20, 25, 35] for more details. In [14], Chen et al. discussed the existence of mild solutions as well as approximate controllability for a class of non-autonomous evolution systems of parabolic type with nonlocal conditions in Banach spaces by using the Schauder’s fixed-point theorem as well as the theory of an evolution family. In the same year, Chen et al. [9] explored the existence of mild solutions for the initial value problem to a new class of abstract evolution equations with non-instantaneous impulses on ordered Banach spaces by using a perturbation technique and by dropping the compactness condition on the semigroup. Malik et al. [28] used the Rothe’s fixed point theorem to study the controllability of non-autonomous nonlinear differential system with non-instantaneous impulses in the space \(\mathbb{R}^{n}\). By using Krasnoselskii’s fixed point theorem, Wang et al. [43] formed a set of sufficient conditions for the existence and stability for a class of impulsive non-autonomous differential equations. Kucche [23] investigated the existence and uniqueness of mild solutions for impulsive delay integrodifferential equations with integral impulses in Banach spaces by using Krasnoselskii–Schaefer fixed point theorem.
Motivated by the above, we discuss the non-autonomous fractional differential system with integral impulses in the following form:
where \({^{C}D}^{q}\) denotes the CFD of order \(0< q\leq 1\), \(J=[0,S]\), \(S\in \mathbb{R}\) is a positive constant. Suppose that F is a Banach space and \(\{\mathbb{A}(s)\}_{s\in J}\) is a family of closed linear operator from F to F. The domain of \(\{\mathbb{A}(s)\}\) is \(D(\mathbb{A})\) which is independent of s and dense in F; \(f:J\times F \to F\) is continuous and with \(G:J\times F \to F\) are given functions; \(0=s_{0}< s_{1}<\cdots <s_{m}<s_{m+1}=S\), \(I_{k}\in C(F,F)\) are bounded functions, \(0\leq \theta _{k}\leq \tau _{k}\leq s_{k}-s_{k-1}\) for \(k=1,2,\ldots,m\), \(\Delta u(s)=u(s_{k}^{+})-u(s_{k}^{-})\), \(u(s_{k}^{+})= \lim _{\epsilon \to 0}u(s_{k}+\epsilon )\), \(u(s_{k}^{-})= \lim _{\epsilon \to 0} u(s_{k}-\epsilon )\).
2 Preliminaries
Let F be a Banach space with norm \(\Vert \cdot \Vert \). Further \(C(J,F)=\{u:u:J\to F \text{ is continuous}\}\) denotes a Banach space with norm \(\Vert u \Vert _{C}=\sup _{s\in J} \Vert u(s) \Vert \) and \(\mathcal{L}(F)\) denotes the Banach space of all bounded linear operators in F with the operator norm topology. Let \(L^{1}(J,F)\) be the Banach space of all Bochner integrable functions with the norm \(\Vert u \Vert _{1}=\int _{0}^{S} \Vert u(s) \Vert \,ds\).
Now, we recall some definitions of fractional derivatives and integral.
Definition 2.1
([22])
The fractional integral operator (in Riemann–Liouville sense) of order \(q>0\) of a function u is defined as
here \(\varGamma (\cdot )\) denotes the Euler Gamma function.
Definition 2.2
([22])
We define the derivative of u of the fractional order \(q>0\) in the Caputo sense as
here \(0< q\leq 1\) and \(u'(t)=\frac{du(t)}{dt}\).
A measurable function \(f:[0, \infty )\to F\) is called Bochner integrable if \(\Vert f \Vert \) is Lebesgue integrable. The integrals which appear in (2.1) and (2.2) are taken in Bochner’s sense. Let the operator \(-\mathbb{A}(s)\) satisfies the following conditions:
- \({(H_{1})}\):
-
\(\mathbb{A}(s)\) is a closed operator, the domain of \(\mathbb{A}(s)\) is independent of s, and dense in F.
- \({(H_{2})}\):
-
For any \(\lambda \geq 0\), the operator \(\lambda I +\mathbb{A}(s)\) has a bounded inverse operator \([\lambda I +\mathbb{A}(s)]^{-1}\) in \(\mathcal{L}(F)\) and
$$\begin{aligned} \bigl\Vert \bigl[\lambda I +\mathbb{A}(s) \bigr]^{-1} \bigr\Vert \leq \frac{C}{ \vert \lambda \vert +1}, \end{aligned}$$where C is a positive constant independent of s and λ.
- \({(H_{3})}\):
-
For any \(s, \tau , t\in J\), there is a constant \(p \in (0,1]\) such that
$$\begin{aligned} \bigl\Vert \bigl[\mathbb{A}(s)-\mathbb{A}(\tau ) \bigr]\mathbb{A}^{-1}(t) \bigr\Vert \leq C \vert s-\tau \vert ^{p}, \end{aligned}$$where the constants p and \(C>0\) are independent of s, τ, and t.
Following Pazy [34], \((H_{1})\) means that for each \(t\in J \), \(-A(t)\) generates an analytic semigroup \(e^{-s\mathbb{A}(t)}\) (\(s>0\)), and there is a \(C > 0\) independent of both s and t such that \(\Vert \mathbb{A}^{n}(t)e^{-s\mathbb{A}(t)} \Vert \leq \frac{C}{s^{n}}\), where \(n=0,1\), \(s>0\), \(t\in J\).
By [18], we can give the definition of operators \(\tilde{\varPsi }(s,t)\), \(\tilde{\varPhi }(s,\sigma )\), and \(\tilde{U}(s)\):
where \(\xi _{q}\) is probability density function defined on \([0,\infty )\) such that it’s Laplace transform is given by
Using the above facts, we define the mild solution of problem (1.1)–(1.3).
Definition 2.3
([29])
A function \(u\in C(J,F)\) is called a mild solution of (1.1)–(1.3) if it satisfies the integral equation
The following lemma gives some properties of \(\tilde{\varPsi }(s, t)\), \(\tilde{\varPhi }(s,\sigma )\), and \(\tilde{U}(s)\) that are required to prove our main result.
Lemma 2.1
([18])
Functions \(\tilde{\varPsi }(s-\sigma ,\sigma )\)and \(\mathbb{A}(s)\tilde{\varPsi }(s-\sigma ,\sigma )\)are continuous in the uniform topology in s and σ, where \(s\in J\), \(0\leq \sigma \leq s-\epsilon \)for any \(\epsilon >0\)and
where \(C > 0\)is independent of both s and σ. Moreover,
and
Next, we define the MNC, which is required in our results.
Definition 2.4
([3])
Assume that G is a bounded set of F. Then the Kuratowski MNC \(\mu (\cdot )\) defined on G is
Some properties of \(\mu (\cdot )\) are given in the following lemma.
Lemma 2.2
([3])
Let Z, W be bounded subsets of F and \(\lambda \in \mathbb{R}\). Then
-
1.
\(\mu (Z) = 0\)if and only if Z̅ is compact, where Z̅ denotes the closure of Z;
-
2.
\(Z \subseteq W\)implies \(\mu (Z) \leq \mu (W)\);
-
3.
\(\mu (\overline{Z}) = \mu (\operatorname{conv} Z) = \mu (Z)\), where convZ denotes the convex hull of Z;
-
4.
\(\mu (Z \cup W) = \max \{ \mu (Z), \mu (W) \}\);
-
5.
\(\mu (\lambda Z) = \vert \lambda \vert \mu (Z)\), where \(\lambda Z = \{ \lambda z : z \in Z \}\);
-
6.
\(\mu (Z + W) \leq \mu (Z) + \mu (W)\), where \(Z + W = \{ z + w: z \in Z, w \in W \}\);
-
7.
If G is any bounded subset of \(D(P)\), and if \(P:D(P)\subset F \to F \)is a Lipschitz-continuous mapping with constant k, then \(\mu (P(G))\leq k\mu (G)\).
In this article, MNC on the set F and \(C(J,F)\) is denoted by \(\mu (\cdot )\) and \(\mu _{C}(\cdot )\), respectively. For any \(s\in J\) and \(B\subset C(J,F)\), we denote \(B(s)=\{u(s): u \in B\}\), then \(B(s)\subset F\). The boundedness of \(B(s)\subset C(J,F)\) implies the boundedness of \(B(s)\) in F and \(\mu (B(s))\leq \mu _{C}(B)\).
The prove our main result, the following lemmas are required.
Lemma 2.3
([3])
Assume that B is a bounded subset of F. Then there is a countable subset \(B_{0}\)of B such that \(\mu (B)\leq 2\mu (B_{0})\).
Lemma 2.4
([31])
If \(B= \{u_{n}\}_{1}^{\infty }\subset C([0,S],F)\)is a countable set in a Banach space F and there is a function \(m\in L^{1}([0,S], \mathbb{R}^{+})\)such that for every \(n\in \mathbb{N}\),
then \(\mu (B(s))\)is Lebesgue integrable on \([0, S]\)and
Lemma 2.5
([2])
If \(B\subset C(J,F)\)is equicontinuous and bounded in a Banach space F then \(\mu (B(s))\)is continuous on \([0, S]\)and \(\mu _{C}(B)=\max _{s\in [0, S]}\mu (B(s))\).
Definition 2.5
([3])
If G is a nonempty subset of F, then \(P:G\to F\) is called to k-set contractive if it is continuous and there is a constant \(k\in [0,1)\) such that for every bounded subset D of G, we have
Lemma 2.6
([3])
Assuming that D is a closed, bounded, and convex subset of F, \(P:D\to D\)has at least one fixed point in D if it is k-set contractive.
3 Main results
- \({(F_{1})}\):
-
For \(r>0\) there are constants \(0< q_{1} < \min (q, p)\), \(\rho > 0\) and a function \(h_{r}\in L^{\frac{1}{q_{1}}}{(J,\mathbb{R}^{+})}\) such that for any \(s \in J \) and \(u\in F\) with \(\Vert u \Vert \leq r\), \(\Vert f(s,u) \Vert \leq h_{r}(s)\) and
$$\begin{aligned} \lim_{r\to \infty }\inf \frac{ \Vert h_{r} \Vert _{L^{\frac{1}{q_{1}}}{[0, S]}}}{r}=\rho \leq \infty ; \end{aligned}$$ - \({(F_{2})}\):
-
There is an \(L > 0 \) such that for every bounded, countable, and equicontinuous set \(D\subset F\),
$$ \mu \bigl(f(s,D) \bigr)\leq L\mu (D)\quad \text{for all } s\in J. $$ - \({(F_{3})}\):
-
There are constants \(L_{N}\), M such that
$$\begin{aligned} \begin{gathered} \bigl\Vert N(s,v_{1})-N(s,v_{2}) \bigr\Vert \leq L_{N} \Vert v_{1}-v_{2} \Vert , \\ M = \sup_{s\in [0,S]} \bigl\Vert N(s,0) \bigr\Vert ; \end{gathered} \end{aligned}$$(3.1) - \({(F_{4})}\):
-
There are constants \(D_{k}\) (\(k=1,2,3,\ldots,m\)) such that
$$\begin{aligned} \bigl\Vert I_{k}(w_{1})-I_{k}(w_{2}) \bigr\Vert \leq D_{k} \Vert w_{1}-w_{2} \Vert ; \quad k=1,2,\ldots,m \text{ for } w_{1},w_{2} \in F. \end{aligned}$$(3.2)
In this study, \(\mathbf{B}(q, p)=\int _{0}^{1}s^{q-1}(1-s)^{p-1}\,ds\) is the Beta function.
Theorem 3.1
If \(f:J\times F\to F \)is continuous and satisfies conditions \((F_{1})\)–\((F_{4})\)then there is at least one mild solution of (1.1)–(1.3) in \(C(J,F)\)provided that
and
Proof: Let the operator \(\mathcal{P}:C(J,F)\to C(J,F)\) be defined by
First, we show that \(\mathcal{P}\) maps \(G_{R}\) to \(G_{R}\) which is a bounded, closed and convex set, where R is a positive constant such that \(G_{R}=\{u\in C(J,F): \Vert u(s) \Vert \leq R \text{ for }\forall s \in J\}\). If this were not true, then there would exist \(s^{r}\in J\) and \(u^{r} \in G_{R}\) such that \(\Vert (\mathcal{P}u^{r})(s^{r}) \Vert >r\) for each \(r>0\). Now by using Hölder inequality, \((F_{1})\) and Lemma 2.1, we get
which gives
Dividing both sides of (3.6) by \(r(1-C^{*}S^{q+1})\), using \((F_{1})\), and taking the limit as \(r\to \infty \), we get
which is a contradiction. Therefore \(\mathcal{P}:G_{R}\to G_{R}\).
Now, we prove that \(\mathcal{P}:G_{R}\to G_{R}\) is a continuous operator. Consider \(\{u_{n}\}_{n=1}^{\infty }\subset G_{R}\) such that \(\lim _{n\to \infty }u_{n}=u\) in \(G_{R}\). Since the function f is continuous in the second variable, for any \(s\in J\), we get
From (3.5) and Lemma 2.1, we get
which gives that, for every \(s\in J\), \(\Vert (\mathcal{P}u_{n})(s)-(\mathcal{P}u)(s) \Vert \to 0\) as \(n\to \infty \),
Therefore, \(\mathcal{P}:G_{R}:\to G_{R}\) is a continuous operator. It remains to prove that \(\{\mathcal{P}u:u\in G_{R}\}\) is an equicontinuous function set. For any \(u\in S_{R}\) and \(s_{1}, s_{2}\in [0,S]\), \(s_{1}< s_{2}\), we get
where
Now, we prove that \(I^{j}\to 0\) independently of \(u\in S_{R}\) as \(s_{2}-s_{1} \to 0\) for \(j=1,2,3,4,5,6,t\).
First, we prove \(I^{1}=0\). For \(\epsilon >0\) and \(s_{1}>0\), by the continuity of \(\tilde{\varPsi }(s-\sigma ,\sigma )\) in the uniform topology in s and σ, for \(0\leq s\leq S\) and \(0\leq \sigma \leq s-\epsilon \), by Lemma 2.1, we have
Obviously, \(I^{2}=0\). For \(\epsilon >0\) and \(s_{1}>0\), using the continuity of \(\tilde{\varPsi }(s-\sigma ,\sigma )\) in the uniform topology in t and σ, for \(0\leq s\leq S\) and \(0\leq \sigma \leq s-\epsilon \), by Lemma 2.1, we get
Obviously, \(I^{3}=0\), for \(s_{1}=0\) and \(0< s_{2}\leq S\). For \(s_{1}>0\) and \(\epsilon >0\), by Lemma 2.1, \((F_{1})\), and since the functions \(\sigma \to (s_{2}-\sigma )^{q-1}I^{p}_{\sigma }h_{R}(\sigma )\) and \(\sigma \to (s_{1}-\sigma )^{q-1}I^{p}_{\sigma }h_{R}(\sigma )\) are Lebesgue integrable, as well as \(\tilde{\varPsi }(s-\sigma ,\sigma )\) is continuous in the uniform operator topology in s and σ, for \(0\leq s\leq S\) and \(0\leq \sigma \leq s-\epsilon \), we get
For \(I^{4}\), by Lemma 2.1, we see that
For \(I^{5}\), using Lemma 2.1, \((F_{1})\), and Hölder inequality, we have
For \(I^{6}\), using Lemma 2.1, \((F_{1})\), and the fact that the function \(\sigma \to (s_{1}-\sigma )^{q-1}I^{p}_{\sigma }h_{R}(\sigma )\) is Lebesgue integrable, we get
Also \(I^{t}=0\) as \(s_{2} \to s_{1}\).
Hence \(\Vert (\mathcal{P}u)(s_{2})-(\mathcal{P}u)(s_{1}) \Vert \) tends to 0 independently of \(u \in G_{R}\) as \(s_{2} \to s_{1}\), which means that the operator \(\mathcal{P}:G_{R}\to G_{R}\) is equicontinuous.
Let \(D=\overline{\operatorname{co}}\mathcal{P}(G_{R})\), where \(\overline{\operatorname{co}}\) denotes the closure of the convex hull. Then it can be easily seen that the operator \(\mathcal{P}:D\to D\) (\(D\subset C(J,F)\)) is equicontinuous.
Now, we show that \(\mathcal{P}:D\to D\) is a condensing operator. For any \(B\subset D\), by Lemma 2.3, there exists a countable set \(B_{0}=\{u_{n}\} \subset B\) such that
From the equicontinuity of B, \(B_{0}\subset B\) is also equicontinuous. Consequently, from Lemma 2.4 and \((F_{2})\), we get
From Lemma 2.5 and since \(\mathcal{P}(B_{0})\subset B\) is bounded and equicontinuous, we have
Therefore, by (2.5)–(2.6), we have
By combining (3.10), (3.4) and Definition 2.5, we know that \(\mathcal{P}:G_{R}\to G_{R}\) is a k-set contractive operator. By Lemma 2.6, \(\mathcal{P}\) has at least one fixed point \(u\in G_{R}\). Therefore \(\mathcal{P}\) is a mild solution of (1.1)–(1.3).
4 Example
Consider the following nonlinear reaction–diffusion equation with integral impulse condition:
where \({^{C}D}^{q}\) is a CFD of order \(0< q\leq 1\), \(b(s)\) is diffusion coefficient which is continuous on \(J=[0,S]\), and \(\vert b(s_{2})-b(s_{1}) \vert \leq C \vert s_{2}-s_{1} \vert ^{p}\), \(s_{1},s_{2}\in J\), \(0< p \leq 1\), C is a positive constant independent of \(s_{1}\) and \(s_{2}\), Δ is Laplace operator; \(S\subset \mathbb{R}^{m}\) is a bounded domain with a sufficiently smooth boundary ∂G; \(f,N: G \times J\times \mathbb{R}\to \mathbb{R}\) are nonlinear functions.
Let \(\Vert \cdot \Vert \) denote the \(L^{2}\)-norm on the Banach space \(F = L^{2}(G)\). In F we define a linear operator by
with the domain
where \(H^{2}(G)\) is the completion of \(C^{2}(G)\) with respect to the norm
\(H^{1}_{0}(G)\) is the completion of \(C^{1}(G)\) with respect to the norm \(\Vert u \Vert _{H^{1}(G)}\), and \(C_{0}^{1}(G)\) is the set of all functions \(u\in C^{1}(G)\) with compact support on the domain G. From [34], we know that \(-\mathbb{A}(t)\) generates an analytic semigroup \(e^{-s\mathbb{A}(t)}\) in E satisfying \((H_{3})\) and \((H_{4})\). Let \(u(s)=u(\cdot , s)\), \(f(s,u(s))=f(\cdot ,s,u(\cdot ,s))\), \(N(s,u(s))=N( \cdot ,s,u(\cdot ,s))\). Then system (4.1)–(4.3) can be modified into system (1.1)–(1.3).
Let the function f satisfy the following condition:
-
(i)
There is a bounded function \(h_{r}(s)\) such that for any \(s\in [0,S]\), \(z \in G\), and \(u \in L^{2}(G)\) satisfying \((\int _{G} \vert u(z) \vert ^{2}\,dz )^{\frac{1}{2}}\leq r\) for some \(r>0\),
$$ \biggl( \int _{G} \bigl\vert f \bigl(s,u(z,s) \bigr) \bigr\vert ^{2}\,dz \biggr)^{\frac{1}{2}}\leq h_{r}(s). $$
Theorem 4.1
Consider the nonlinear function \(f(z,s,u(z,s))=\frac{\cos (z,s,u(z,s))}{e^{s}}\)and the function \(I_{1}:\mathbb{R}\to \mathbb{R}\)defined by \(I_{1}(z)=\cos z\). Then for the choices \(\theta _{1}=0\), \(\tau _{1}=1\), problem (4.1)–(4.3) has at least one mild solution.
Proof: By the definition of f, condition \((F_{1})\) is clearly satisfied. Also \(I_{1}\) and N are Lipschitz functions. Condition (3.4) is satisfied with \(q=\frac{1}{2}\) and \(0\leq q_{1}<\frac{1}{2}\), \(h_{r}(s)=\frac{\sqrt{\operatorname{meas}(G)}}{e^{s}}\), \(\rho =0\). So all the assumptions of Theorem 3.4 are satisfied. Hence the initial boundary value problem to the nonlinear reaction–diffusion equation with integral impulse condition has at least one mild solution due to Theorem 3.1.
5 Conclusions
The existence of solutions of non-autonomous fractional differential equations with integral impulse condition by using the measure of non-compactness has been discussed in this article. One can extend this work for impulsive non-autonomous fractional differential equations with integral impulse condition by using the fixed point theorems.
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Kumar, A., Chauhan, H.V.S., Ravichandran, C. et al. Existence of solutions of non-autonomous fractional differential equations with integral impulse condition. Adv Differ Equ 2020, 434 (2020). https://doi.org/10.1186/s13662-020-02888-3
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DOI: https://doi.org/10.1186/s13662-020-02888-3