Abstract
In this article, we study a class of fractional coupled systems with Riemann-Stieltjes integral boundary conditions and generalized p-Laplacian which involves two different parameters. Based on the Guo-Krasnosel’skii fixed point theorem, some new results on the existence and nonexistence of positive solutions for the fractional system are received, the impact of the two different parameters on the existence and nonexistence of positive solutions is also investigated. An example is then given to illuminate the application of the main results.
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1 Introduction
In this paper, our main research is the existence and nonexistence of positive solutions for the following fractional coupled system with generalized p-Laplacian involving Riemann-Stieltjes integral conditions.
where \(\lambda_{i}>0\) (\(i=1, 2\)) is a parameter, \(1<\beta_{i}\leq2\), \(n-1<\alpha_{1} \leq n \), \(m-1<\alpha_{2} \leq m \), \(n, m\geq2\), \(D^{\alpha_{i}}_{0^{+}}\), \(D^{\beta_{i}}_{0^{+}}\) are the standard Riemann-Liouville derivatives. \(\mu_{i}>0\) is a constant, \(g_{i}:(0,1) \rightarrow[0, +\infty)\) is continuous with \(g_{i}\in L^{1}(0, 1)\), \(A_{i}\) is right continuous on \([0, 1)\), left continuous at \(t = 1\), and nondecreasing on \([0, 1]\), \(A_{i}(0) = 0\), \(\int_{0}^{1}x(s)\,dA _{i}(s)\) denotes the Riemann-Stieltjes integrals of x with respect to \(A_{i}\), ϕ is a generalized p-Laplacian operator and satisfies the following condition \((\mathbf{H}_{0})\).
The positive solution \((u,v)\) of system (1) means that \((u, v) \in C[0, 1]\times C[0, 1]\), \((u, v)\) satisfies system (1) and \(u(t)>0\), \(v(t)>0\) for all \(t\in(0, 1]\).
- \((\mathbf{H}_{0})\) :
-
\(\phi:\mathbb{R}\rightarrow\mathbb{R}\) is an odd, increasing homeomorphism, and there exist two increasing homeomorphisms \(\psi_{1}, \psi_{2}:(0, +\infty)\rightarrow(0, +\infty)\) such that
$$ \psi_{1}(x)\phi(y)\leq\phi(xy)\leq\psi_{2}(x)\phi(y), \quad x, y>0. $$
Moreover, \(\phi,\phi^{-1}\in C^{1}(\mathbb{R})\), where \(\phi^{-1}\) denotes the inverse of ϕ and \(\mathbb{R}=(-\infty, +\infty)\).
Lemma 1.1
([1])
Assume that \((\mathbf{H}_{0})\) holds. Then
For ϕ satisfying \((\mathbf{H}_{0})\), we call it a generalized p-Laplacian operator, it contains two important special cases: \(\phi(u)=u\) and \(\phi(u)=\vert u\vert ^{p-2}u\) (\(p>1\)) (see [1]). Many researchers have studied the existence of positive solutions for two above cases due to their great application background (see [2–15]). Combined with the fractional calculus, the application of the above two kinds of special circumstances becomes more extensive and practical. For the sake of considering the turbulent flow in a porous medium, the governing equation
was presented by Leibenson (see [2]). If \(p = 1\), \(m > 0\), it is used as a nonlinear model for the dispersion of animals and insects (see [3]).
In [4], Lu et al. studied the existence of positive solution for the fractional boundary value problem with a p-Laplacian operator:
where \(2 <\alpha\leq3\), \(1 <\beta\leq2\), \(D^{\alpha}_{0^{+}} \), \(D^{\beta}_{0^{+}} \) are the standard Riemann-Liouville fractional derivatives, \(\phi_{p}(s) =\vert s\vert ^{p-2}s\), \(p> 1\), \(\phi^{-1}_{p} =\phi _{q}\), \(\frac{1}{p}+ \frac{1}{q} = 1\), \(f: [0,1]\times[0,+\infty) \rightarrow[0, +\infty)\) is a continuous function. By the properties of Green’s function and the Guo-Krasnosel’skii fixed point theorem, some results on the existence of positive solutions are obtained.
In [5], Wang et al. investigated the same equation as (3) for \(1 <\alpha\leq2\), \(0 <\beta\leq1\), with boundary value condition \(u(0) = 0\), \(D^{\alpha}_{0^{+}}u(0)= 0\), \(u(1)=au( \xi)\), where \(0\leq a\leq1\), \(0<\xi<1\), \(f: [0,1]\times[0,+\infty )\rightarrow[0, +\infty)\) is a continuous function. Through the application of the Guo-Krasnosel’skii fixed point theorem and the Leggett-Williams theorem, sufficient conditions for the existence of positive solutions are received.
In system (1), \(\int_{0}^{1}g_{1}(s)v(s)\,dA_{1}(s)\), \(\int_{0} ^{1}g_{2}(s)u(s)\,dA_{2}(s)\) denote the Riemann-Stieltjes integrals, and \(A_{i}\) is a function of bounded variation, which implies that \(dA_{i}\) can be a signed measure. Then, a multipoint boundary value problem and an integral boundary value problem are included in our study, that is to say, system (1) includes more generalized boundary value conditions. Henderson and Luca in [16] considered the following system:
where \(\lambda_{i}>0\) (\(i=1, 2\)) is a parameter, \(n-1<\alpha_{1} \leq n \), \(m-1<\alpha_{2} \leq m \), \(n, m\geq2\), \(D^{\alpha_{i}}_{0^{+}}\), \(D^{\beta_{i}}_{0^{+}}\) are the standard Riemann-Liouville derivatives. \(a_{i}>0\), \(b_{i}>0\) are constants, \(f_{i}: [0,1]\times[0,+\infty)\times[0,+\infty) \rightarrow[0, + \infty)\) is a continuous function. By the Guo-Krasnosel’skii fixed point theorem, the authors in [16] got the existence of positive solutions on system (4). System (4) with uncoupled and coupled multi-point boundary value conditions
has been studied in many papers, where \(\mu_{i}>0\) is a constant, for \(\mu_{i}=1\) as an exceptional case ( see [17–23] and the references therein). However, these articles only study the existence of positive solutions for the system, and do not relate to the nonexistence of positive solutions.
Up to now, coupled boundary value conditions for a fractional differential system with generalized p-Laplacian like system (1) have seldom been considered when \(\lambda_{1}\), \(\lambda_{2}\) are different. Motivated by the results mentioned above, in this paper, we obtain several new existence and nonexistence results for positive solutions in terms of different values of the parameter \(\lambda_{i}\) by using the properties of Green’s function and the Guo-Krasnosel’skii fixed point theorem on cone. Especially, paying attention to the nonlinear operator \(D^{\beta}_{0^{+}}(\phi(D^{\alpha}_{0^{+}}))\) with the discussion in (1), we can convert it to the linear operator \(D^{\beta}_{0^{+}}D^{\alpha}_{0^{+}}\), if \(\phi(u)=u\), and the additive index law
holds under some reasonable constraints on the function u (see [24]). Therefore, our article promotes, includes and improves the previous results in a certain degree.
2 Preliminaries and lemmas
For convenience of the reader, we present some necessary definitions about fractional calculus theory.
Definition 2.1
Let \(\alpha>0\) and u be piecewise continuous on \((0, +\infty)\) and integrable on any finite subinterval of \([0, +\infty)\). Then, for \(t>0\), we call
the Riemann-Liouville fractional integral of u of order α.
Definition 2.2
The Riemann-Liouville fractional derivative of order \(\alpha>0\), \({n-1}\leq\alpha< n\), \(n\in\mathbb{N}\), is defined as
where \(\mathbb{N}\) denotes the natural number set, the function \(u(t)\) is n times continuously differentiable on \([0, +\infty)\).
Lemma 2.1
Let \(\alpha>0\), if the fractional derivatives \(D^{\alpha-1}_{0^{+}}u(t)\) and \(D^{\alpha} _{0^{+}}u(t)\) are continuous on \([0, +\infty)\), then
where \(c_{1}, c_{2}, \ldots, c_{n}\in(-\infty, +\infty )\), n is the smallest integer greater than or equal to α.
Similarly to the proof in [22], it enables us to obtain the following Lemmas 2.2, 2.3 and Remark 2.1.
Lemma 2.2
Assume that the following condition \(( \mathbf{H}_{1})\) holds.
- \((\mathbf{H}_{1})\) :
-
$$ \begin{aligned} &k_{1}= \int_{0}^{1}g_{1}(t)t^{\alpha_{2}-1}\,dA_{1}(t)>0, \quad\quad k_{2}= \int _{0}^{1}g_{2}(t)t^{\alpha_{1}-1}\,dA_{2}(t)>0, \\ & 1-\mu_{1}\mu_{2}k_{1}k _{2}>0. \end{aligned} $$
Let \(h_{i}\in C(0, 1)\cap L(0, 1)\) (\(i=1, 2\)), then the system with the coupled boundary conditions
has a unique integral representation
where
and
Lemma 2.3
For \(t, s\in[0, 1]\), the functions \(K_{i}(t, s)\) and \(H_{i}(t, s)\) (\(i=1, 2\)) defined as (7) satisfy
where
Remark 2.1
From Lemma 2.3, for \(t,\widetilde{t},s \in[0, 1]\), we have
where \(\omega=\frac{\varrho}{\rho}\), ϱ, ρ are defined as in Lemma 2.3, \(0<\omega<1\).
From Lemmas 2.1 and 2.2, we obtain the following Lemma 2.4.
Lemma 2.4
Let \(1<\beta_{i}\leq2\), \(n-1<\alpha_{1} \leq n \), \(m-1<\alpha_{2} \leq m \), \(h_{i}\in C(0, 1)\cap L(0, 1)\) (\(i=1, 2\)), the following system of fractional differential equations
has a unique integral representation
where
Lemma 2.5
([26])
The function \({G}_{i}(s, \tau)\) defined as (8) is continuous on \([0,1]\times[0,1]\), and for \(s, \tau\in[0,1]\), \({G}_{i}(s,\tau)\) satisfies
In the rest of the paper, we always suppose that the following assumption holds:
- \((\mathbf{H}_{2})\) :
-
\(f_{i}: [0,1]\times[0,+\infty)\times[0,+ \infty) \rightarrow[0, +\infty)\) is continuous.
Let \(X=C[0, 1]\times C[0, 1]\), then X is a Banach space with the norm
Denote
where ω is defined as Remark 2.1. It is easy to see that K is a positive cone in X. Under the above conditions \((\mathbf{H}_{0})( \mathbf{H}_{1})(\mathbf{H}_{2})\), for any \((u,v)\in K\), we can define an integral operator \(T: K\to X\) by
we know that \((u, v)\) is a positive solution of system (1) if and only if \((u, v)\) is a fixed point of T in K.
Lemma 2.6
Assume that \((\mathbf{H}_{0})(\mathbf{H}_{1})( \mathbf{H}_{2})\) hold. Then \(T: K\to K\) is a completely continuous operator.
Proof
By the routine discussion, we know that \(T: K\rightarrow X\) is well defined, so we only prove \(T(K)\subseteq K\). For any \((u, v)\in K\), \(0\leq t\), \(\widetilde{t}\leq1\), by Remark 2.1, we have
On the other hand,
Then we have
i.e.,
In the same way as (11) and (12), we can prove that
Therefore, we have \(T ( K ) \subseteq K\).
According to the Ascoli-Arzela theorem, we can easily get that \(T: K\rightarrow K\) is completely continuous. The proof is completed. □
In order to obtain the existence of the positive solutions of system (1), we will use the following cone compression and expansion fixed point theorem.
Lemma 2.7
([27])
Let P be a positive cone in a Banach space E, \(\Omega_{1}\) and \(\Omega_{2}\) are bounded open sets in E, \(\theta\in\Omega_{1}\), \(\overline{\Omega}_{1}\subset\Omega _{2}\), \(A :P\cap\overline{\Omega}_{2}\backslash\Omega_{1} \rightarrow P\) is a completely continuous operator. If the following conditions are satisfied:
or
then A has at least one fixed point in \(P\cap(\overline{\Omega} _{2}\backslash\Omega_{1})\).
3 Main results
Denote
3.1 Existence of system (1)
Theorem 3.1
Assume that \((\mathbf{H}_{0})(\mathbf{H} _{1})(\mathbf{H}_{2})\) hold and \(f_{i\infty}\varphi_{1}(L_{1}^{-1})>f _{i}^{0}\varphi_{2}(L_{2}^{-1})\), then system (1) has at least one positive solution for
where we impose \(\frac{1}{f_{i\infty}}=0\) if \(f_{i\infty}=+\infty\) and \(\frac{1}{f_{i}^{0}}=+\infty\) if \(f_{i}^{0}=0\) (\(i=1, 2\)).
Proof
For any \(\lambda_{i}\) satisfying (13), there exists \(\varepsilon_{0}>0\) such that
By the definition of \(f_{i}^{0}\), there exists \(r_{1}>0\) such that
Let \(K_{r_{1}}=\{(u, v)\in K: \Vert (u, v)\Vert < r_{1} \}\). For any \((u, v)\in\partial K_{r_{1}}\), \(t\in[0, 1]\), by the definition of \(\Vert \cdot \Vert \), we know that
Thus, for any \((u, v)\in\partial K_{r_{1}}\), by (15), (16) and \((\mathbf{H}_{0})\), we have
Hence, for any \((u, v)\in\partial K_{r_{1}}\), by Lemmas 1.1, 2.3, 2.5 and (17), we conclude that
Similarly to (18), for any \((u, v)\in\partial K_{r_{1}}\), we also have
Consequently, we have
On the other hand, by the definition of \(f_{i\infty}\), there exist \(r_{1}', r_{2}'>0\) such that
Choose \(r_{2}=\max \{ \frac{r_{1}'}{\omega\theta},\frac{r_{2}'}{ \omega\theta},2r_{1} \} \). Let \(K_{r_{2}}=\{(u, v)\in K:\Vert (u, v)\Vert < r_{2}\}\). For any \((u, v)\in\partial K_{r_{2}} \), by the definition of \(\Vert \cdot \Vert \), we have
Thus, for any \((u, v)\in\partial K_{r_{2}}\), by (20), (21) and \((\mathbf{H}_{0})\), we have
Hence, for any \((u, v)\in\partial K_{r_{2}}\), by Lemmas 1.1, 2.3, 2.5 and (22), we have
Therefore, we obtain
It follows from the above discussion, (18), (24), Lemmas 2.6 and 2.7 that, for any \(\lambda_{i}\in ( \frac {\varphi_{2}(L _{2}^{-1})}{f_{i\infty}}, \frac{\varphi_{1}(L_{1}^{-1})}{f_{i}^{0}} ) \), T has a fixed point \((u, v)\in\overline{K}_{r_{2}}\setminus K_{r_{1}}\), so system (1) has at least one positive solution \((u,v)\); moreover, \((u,v)\) satisfies \(r_{1}\leq \Vert (u,v)\Vert \leq r_{2}\). The proof is completed. □
Remark 3.1
From the proof of Theorem 3.1, if we choose
then for \(\lambda_{1}\in ( \frac{\varphi_{2}(\overline{L}_{2}^{-1})}{f _{1\infty}}, \frac{\varphi_{1}(L_{1}^{-1})}{f_{1}^{0}} ) \), \(\lambda_{2}\in ( 0, \frac{\varphi_{1}(L_{1}^{-1})}{f_{2}^{0}} ) \), the conclusion of Theorem 3.1 is valid.
Or we choose
then, for \(\lambda_{1}\in ( 0, \frac{\varphi_{1}(L_{1}^{-1})}{f _{1}^{0}} ) \), \(\lambda_{2}\in ( \frac{\varphi_{2}( \widetilde{{L}}_{2}^{-1})}{f_{2\infty}}, \frac{\varphi_{1}(L_{1}^{-1})}{f _{2}^{0}} ) \), the conclusion of Theorem 3.1 is valid.
Theorem 3.2
Assume that \((\mathbf{H}_{0})(\mathbf{H} _{1})(\mathbf{H}_{2})\) hold and \(f_{i0}\varphi_{1}(L_{1}^{-1})>f_{i} ^{\infty}\varphi_{2}(L_{2}^{-1})\), then system (1) has at least one positive solution for
where we impose \(\frac{1}{f_{i0}}=0\) if \(f_{i0}=+\infty\) and \(\frac{1}{f_{i}^{\infty}}=+\infty\) if \(f_{i}^{\infty}=0\), \(i=1, 2\).
The proof of Theorem 3.2 is similar to that of Theorem 3.1, and so we omit it.
Remark 3.2
Similar to Remark 3.1, if we choose \(\overline{L}_{2}\) as (25), then for \(\lambda_{1}\in ( \frac{ \varphi_{2}(\overline{L}_{2}^{-1})}{f_{10}}, \frac{\varphi_{1}(L_{1} ^{-1})}{f_{1}^{\infty}} ) \), \(\lambda_{2}\in ( 0, \frac{ \varphi_{1}(L_{1}^{-1})}{f_{2}^{\infty}} ) \), the conclusion of Theorem 3.2 is valid.
Or we choose \(\widetilde{{L}}_{2}\) as (26), then for \(\lambda _{1}\in ( 0, \frac{\varphi_{1}(L_{1}^{-1})}{f_{1}^{\infty}} ) \), \(\lambda_{2} \in ( \frac{\varphi_{2}(\widetilde{{L}}_{2}^{-1})}{f_{20}}, \frac{ \varphi_{1}(L_{1}^{-1})}{f_{2}^{\infty}} ) \), the conclusion of Theorem 3.2 is valid.
Theorem 3.3
Assume that \((\mathbf{H}_{0})(\mathbf{H} _{1})(\mathbf{H}_{2})\) hold and there exist \(R>r>0\) such that
Then system (1) has at least one positive solution \((u, v)\); moreover, \((u,v)\) satisfies \(r\leq \Vert (u,v)\Vert \leq R\).
Proof
Set \(K_{r}=\{(u, v)\in K:\Vert (u, v)\Vert < r\}\). For any \((u, v)\in\partial K_{r} \), by the definition of \(\Vert \cdot \Vert \), we have
Thus, for any \((u, v)\in\partial K_{r}\), by the first inequality of (27), we have
Hence, for any \((u, v)\in\partial K_{r}\), by Lemmas 1.1, 2.3, 2.5 and (28), we have
Therefore, we obtain
Choose \(K_{R}=\{(u, v)\in K: \Vert (u, v)\Vert < R \}\). For any \((u, v)\in \partial K_{R}\), \(t\in[0, 1]\), by the definition of \(\Vert \cdot \Vert \), we know that
Thus, for any \((u, v)\in\partial K_{R}\), by the first inequality of (27) and (31), we have
Hence, for any \((u, v)\in\partial K_{R}\), by Lemmas 1.1, 2.3, 2.5 and (32), we can gain
Similarly to (33), for any \((u, v)\in\partial K_{R}\), we also have
Consequently, we have
It follows from the above discussion, (30), (34), Lemmas 2.6 and 2.7 that T has a fixed point \((u, v)\in \overline{K}_{R} \setminus K_{r}\), so system (1) has at least one positive solution \((u,v)\); moreover, \((u,v)\) satisfies \(r\leq \Vert (u,v)\Vert \leq R\). The proof is completed. □
Remark 3.3
From the proof of Theorem 3.3, if we choose
then for
the conclusion of Theorem 3.3 is valid.
Or we choose
Then, for
the conclusion of Theorem 3.3 is valid.
Theorem 3.4
Assume that \((\mathbf{H}_{0})(\mathbf{H} _{1})(\mathbf{H}_{2})\) hold and \(f_{i0}=f_{i\infty}=+\infty\), then there exists \(\lambda_{i}^{*}>0\) such that system (1) has at least two positive solutions for \(\lambda_{i}\in(0, \lambda_{i}^{*})\), \(i=1, 2\).
Proof
Choose \(r>0\), define
In view of the continuity of \(f_{i}\) and \(f_{i0}=f_{i\infty}=+\infty \), we know \(\chi_{i}(r): (0, +\infty)\rightarrow(0, +\infty)\) is continuous and
So, there exists \(r^{*}\in(0, +\infty)\) such that \(\chi_{i}(r^{*})= \sup_{r>0}\chi_{i}(r)=\lambda_{i}^{*}\). Therefore, for \(\lambda_{i} \in(0, \lambda_{i}^{*})\), we can find \(r_{1}\), \(r_{2}\) (\(0< r_{1}< r ^{*}< r_{2}<+\infty\)) satisfying \(\chi_{i}(r_{1})=\lambda_{1}\), \(\chi _{i}(r_{2})=\lambda_{2}\). Thus, by \((\mathbf{H}_{0})\), we have
From the condition \(f_{i0}=f_{i\infty}=+\infty\), there exist \(R_{1}\), \(R_{2}\) (\(0< R_{1}< r_{1}< r^{*}< r_{2}< R_{2}<+\infty\)) satisfying
Hence, by \((\mathbf{H}_{0})\), we get
By (37) and (39), (38) and (40), combining with Lemmas 2.6, 2.7 and Theorem 3.3, system (1) has at least two positive solutions for \(\lambda_{i}\in(0, \lambda_{i}^{*})\), \(i=1, 2\). The proof is completed. □
Remark 3.4
From the proof of Theorem 3.4, assume that \((\mathbf{H}_{0})(\mathbf{H}_{1})(\mathbf{H}_{2})\) hold, if \(f_{i0}=+\infty\) or \(f_{i\infty}=+\infty\), then there exists \(\lambda_{i}^{*}>0\) such that system (1) has at least one positive solution for \(\lambda_{i}\in(0, \lambda_{i}^{*})\), \(i=1, 2\).
3.2 Nonexistence of system (1)
Theorem 3.5
Assume that \((\mathbf{H}_{0})(\mathbf{H} _{1})(\mathbf{H}_{2})\) hold and \(f_{i}^{\infty}<+\infty\), \(f_{i}^{0}<+\infty\), then there exists \(\lambda_{i0}>0\) such that for \(\lambda_{i}\in(0, \lambda_{i0})\) (\(i=1, 2\)), system (1) has no positive solution.
Proof
From the definitions of \(f_{i}^{\infty}\), \(f_{i}^{0}\), which are finite, there exist positive constants \(M_{i}^{1}\), \(M_{i}^{2}\) and \(R_{1}\), \(R_{2}\) (\(R_{1}< R_{2}\)) such that
Set \(M_{i}^{0}=\max \{ M_{i}^{1},M_{i}^{2},\max_{ { t\in[0, 1], R_{1}\leq x, y\leq R_{2}}}\frac{f_{i}(t, x, y)}{ \max\{\phi(x), \phi(y)\}} \} \), we have
Assume that \((u, v)\) is a positive solution of system (1), we will show that this leads to a contradiction. Define \(\lambda_{i0}= {(M_{i}^{0})}^{-1}\varphi_{1}(L_{1}^{-1})\), since \(\lambda_{i}\in(0, \lambda_{i0})\), by Lemmas 1.1, 2.3 and 2.5, we conclude that
Therefore, we conclude
Similarly to (41) (42), we also have
which is a contradiction. Therefore, system (1) has no positive solution. The proof is completed. □
Theorem 3.6
Assume that \((\mathbf{H}_{0})(\mathbf{H} _{1})(\mathbf{H}_{2})\) hold and \(f_{i\infty}>0\), \(f_{i 0}>0\), \(f_{i}(t, x, y)>0\) for \(t\in[a, b]\subset(0, 1)\), \(x\geq0\), \(y>0\) or \(t\in[a, b]\subset(0, 1)\), \(x>0\), \(y\geq0\), then there exists \(\lambda_{i*}>0\) such that for \(\lambda_{i}\in(\lambda_{i*}, +\infty )\) (\(i=1, 2\)), system (1) has no positive solution.
Proof
From the definitions of \(f_{i\infty}\), \(f_{i0}\), which are finite, there exist positive constants \(m_{i}^{1}\), \(m_{i}^{2}\) and \(R_{3}\), \(R_{4}\) (\(R_{3}< R_{4}\)) such that
Set \(m_{1}^{0}=\min \{ m_{1}^{1},m_{1}^{2}, \min_{{ t\in[a, b]\subset(0, 1), R_{3}\leq x, y\leq R_{4}}}\frac{f _{1}(t, x, y)}{\phi(x)} \} \), we have
Similarly, set \(m_{2}^{0}=\min \{ m_{2}^{1},m_{2}^{2}, \min_{{ t\in[a, b]\subset(0, 1), R_{3}\leq x, y\leq R_{4}}}\frac{f _{2}(t, x, y)}{\phi(y)} \} \), we have
Assume that \((u, v)\) is a positive solution of system (1), we will show that this leads to a contradiction. Define \(\lambda_{i*}= {(m_{i}^{0})}^{-1}\varphi_{2}(L_{2}^{-1})\), since \(\lambda_{i}\in( \lambda_{i*}, +\infty)\), by Lemmas 1.1, 2.3 and 2.5, we conclude that
Similarly to (45), we also have
which is a contradiction. Therefore, system (1) has no positive solution. The proof is completed. □
Similar to the proof of Theorem 3.6, we obtain the following Theorems 3.7 and 3.8.
Theorem 3.7
Assume that \((\mathbf{H}_{0})(\mathbf{H} _{1})(\mathbf{H}_{2})\) hold and \(f_{1\infty}>0\), \(f_{10}>0\), \(f_{1}(t, x, y)>0\) for \(t\in[a, b]\subset(0, 1)\), \(x\geq0\), \(y>0\) or \(t\in[a, b]\subset(0, 1)\), \(x>0\), \(y\geq0\), then there exists \(\lambda_{1*}>0\) such that for \(\lambda_{1}\in(\lambda_{1*}, +\infty )\), \(\lambda_{2}\in(0, +\infty)\), system (1) has no positive solution.
Theorem 3.8
Assume that \((\mathbf{H}_{0})(\mathbf{H} _{1})(\mathbf{H}_{2})\) hold and \(f_{2\infty}>0\), \(f_{2 0}>0\), \(f_{2}(t, x, y)>0\) for \(t\in[a, b]\subset(0, 1)\), \(x\geq0\), \(y>0\) or \(t\in[a, b]\subset(0, 1)\), \(x>0\), \(y\geq0\), then there exists \(\lambda_{2*}>0\) such that for \(\lambda_{2}\in(\lambda_{2*}, +\infty )\), \(\lambda_{1}\in(0, +\infty)\), system (1) has no positive solution.
Remark 3.5
From the proof of Theorems 3.1-3.8, if we choose
4 Example
Consider the fractional differential system
where \(\lambda_{i}>0\) (\(i=1, 2\)) is a parameter, \(\alpha_{1}=\alpha _{2}=\frac{5}{2}\), \(\beta_{1}=\beta_{2}=\frac{3}{2}\), \(\mu_{1}= \frac{1}{2}\), \(\mu_{2}=1\), \(A_{1}(t)=t\), \(A_{2}(t)=t^{\frac{1}{2}}\), \(g_{1}(t)=t^{-\frac{1}{2}}\), \(g_{2}(t)=1\), \(\phi(x)=x\), choose \(\varphi_{1}(x)=\varphi_{2}(x)=x\). Then we have
So, condition \((\mathbf{H}_{1})\) holds. Next, in order to demonstrate the application of our main results obtained in Section 3, we choose two different sets of functions \(f_{i}\) (\(i= 1,2\)) such that \(f_{i}\) satisfies the conditions of Theorems 3.1 and 3.5.
Case 1. Let \(f_{1}(t, x, y)=\frac{x^{2}}{1+t}+x\sin y\), \(f_{2}(t, x, y)=\frac{y ^{2}}{e^{t}}+y\sin x\), choose \([ \frac{1}{4}, \frac{2}{2} ] \subset[0,1]\), we know \(f_{i\infty}=+\infty\), \(f_{i}^{0}=0\). Then, by Theorem 3.1, system (48) has at least one positive solution for \(\lambda_{i}\in(0, +\infty)\) (\(i=1, 2\)).
Case 2. Let \(f_{1}(t, x, y)=\frac{(10x^{2}+x)(3+\sin y)}{(1+t)(x+1)}\), \(f_{2}(t, x, y)=\frac{(10y^{2}+y)(2+\sin x)}{e^{t}(y+1)}\), therefore, we have \(f_{1}^{\infty}=40\), \(f_{1}^{0}=3\), \(f_{2}^{\infty}=30\), \(f_{2}^{0}=2\), and for \(x, y\leq0\), we get \(x\leq f_{1}(t, x, y) \leq40x\), \(y\leq f_{2}(t, x, y)\leq30y\). By calculation, we obtain \(L_{1} =2.2445\int_{0}^{1}\frac{\tau^{\frac{1}{2}}(1-\tau)^{- \frac{1}{2}}}{\Gamma(\frac{3}{2})}\,d\tau\approx0.6632\). Then, by Theorem 3.5, system (48) has no positive solution for \(\lambda_{1}\in(0, 0.0377)\), \(\lambda_{2}\in(0, 0.0503)\).
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Acknowledgements
The authors were supported financially by the National Natural Science Foundation of China (11626125, 11701252), Natural Science Foundation of Shandong Province of China (ZR2016AP04), China Postdoctoral Science Foundation funded project (2017M612231), a Project of Shandong Province Higher Educational Science and Technology Program (J16LI03), the Science Research Foundation for Doctoral Authorities of Linyi University (LYDX2016BS080), and the Applied Mathematics Enhancement Program of Linyi University.
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Wang, Y., Jiang, J. Existence and nonexistence of positive solutions for the fractional coupled system involving generalized p-Laplacian. Adv Differ Equ 2017, 337 (2017). https://doi.org/10.1186/s13662-017-1385-x
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DOI: https://doi.org/10.1186/s13662-017-1385-x