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Existence of Positive Solutions for Nonlocal Fourth-Order Boundary Value Problem with Variable Parameter
Fixed Point Theory and Applications volume 2011, Article number: 604046 (2011)
Abstract
By using the Krasnoselskii's fixed point theorem and operator spectral theorem, the existence of positive solutions for the nonlocal fourth-order boundary value problem with variable parameter , , , is considered, where is a parameter, and , .
1. Introduction
The existence of positive solutions for nonlinear fourth-order multipoint boundary value problems has been studied by many authors using nonlinear alternatives of Leray-Schauder, the fixed point theory, and the method of upper and lower solutions (see, e.g., [1–15] and references therein). The multipoint boundary value problem is in fact a special case of the boundary value problem with integral boundary conditions.
Recently, Bai [16] studied the existence of positive solutions of nonlocal fourth-order boundary value problem
under the assumption:
(A1) and ,
(A2), , , , , .
In this paper, we study the above generalizing form with variable parameters BVP
where , is a parameter.
Obviously, BVP(1.1) can be regarded as the special case of BVP(1.2) with . Since the parameters is variable, we cannot expect to transform directly BVP(1.2) into an integral equation as in [16]. We will apply the cone fixed point theory, combining with the operator spectra theorem to establish the existence of positive solutions of BVP(1.2). Our results generalize the main result in [16].
Let , and we assume that the following conditions hold throughout the paper:
(H1) and ,
(H2), , , and , .
2. The Preliminary Lemmas
Set , and
By (H1), (H2), we get , . Denote by the Green's function of the problem
and the Green's function of the problem
Then, carefully calculation yield
Lemma 2.1 (see [16]).
Suppose that (A1), (A2) hold. Then, for any , solves the problem
if and only if
Let , and , for . , , , , .
It is easy to show that are norms on .
Lemma 2.2 (see [16]).
and () is a Banach space.
Lemma 2.3 (see [5]).
Assume that (A1), (A2) hold. Then,
(i), for , ; , for , ,
(ii), for , ,
where , ; , .
Denote
Computations yield the following results.
Lemma 2.4 (see [3]).
(i)when , ,
(ii)when , ,
(iii)when , .
Lemma 2.5 (see [16]).
Suppose that (A1), (A2) hold and , , are given as above. Then,
(i),
(ii), .
By Lemmas 2.4 and 2.5, .
Take , by Lemma 2.5, .
Define
Lemma 2.6.
is completely continuous, and .
Proof.
It is similar to Lemma 6 of [3], so we omit it.
Lemma 2.7 (see [17]).
Let E be a Banach space, a cone, and , be two bounded open sets of with . Suppose that is a completely continuous operator such that either
(i) and , , or
(ii) and ,
holds. Then, has a fixed point in .
3. The Main Results
Suppose that , , , , , , and , are defined as in Section 2, we introduce some notations as follows:
Theorem 3.1.
Assume that (H1), (H2) hold and . Then BVP(1.2) has at least one positive solution if one of the following cases holds:
(i), ,
(ii), .
Proof.
For any , consider the following BVP:
It is easy to see that the above question is equivalent to the following question:
For any , let . Obviously, the operator is linear. By Lemma 2.2, for all , , . Hence , and so . On the other hand, is a solution of (3.3) if and only if satisfies , that is,
Owing to and , the operator maps into . From (by Lemma 2.6) together with and condition , applying operator spectral theorem, we have that the exists and is bounded. Let , then (3.4) is equivalent to . By the Neumann expansion formula, can be expressed by
The complete continuity of with the continuity of yields that the operator is completely continuous. For all , let , then , and . So, we have, . Hence,
and so , .
Assume that for all , , , let , by (3.6) we have , and so , . Thus by induction, it follows that, for all , , . By (3.5), for all , we have
and so .
On the other hand, for all , we have
For any , define . By (H1) and (H2), we have that is continuous. It is easy to see that being a positive solution of BVP(1.2) is equivalent to being a nonzero solution equation as follows:
Let . Obviously, is completely continuous. We next show that the operator has a nonzero fixed point in . Let
It is easy to know that is a cone in , . Now, we show .
For , by (2.7), there is ,. Hence, by (3.7), ,,. By proof of Lemma 2.5 in [16],
By (3.7) and (3.10),
Thus .
-
(i)
Since , by the definition of , there exists such that
(3.15)
Let , one has
So, by (3.10), we get
Hence, for ,
On the other hand, since , there exists such that
Choose , let . For ,, there is . Thus,
Hence, for ,
By the use of the Krasnoselskii's fixed point theorem, we know there exists such that , namely, is a solution of (1.2) and satisfied , , .
-
(ii)
The proof is similar to (i), so we omit it.
Corollary 3.2.
Assume that (H1), (H2) hold, and . Then that (1.2) has at least two positive solution, if satisfy
(i), ,
(ii)There exists such that , for , .
Proof.
By the proof of Theorem 3.1, we know that (1) from the condition , there exists , such that , , (2) from the condition , there exists , , such that , , (3) from the condition (ii), there exists , , such that , . By the use of Krasnoselskii's fixed point theorem, it is easy to know that (1.2) has at least two positive solutions.
Corollary 3.3.
Assume (H1), (H2) hold, and . Then problem (1.2) has at least two positive solution, if satisfy
(i), ,
(ii)There exists such that , for , .
Proof.
The proof is similar to Corollary 3.2, so we omit it.
Example 3.4.
Consider the following boundary value problem
In this problem, we know that ,,, , then we can get , , , , , , . Further more, we obtain , , then , , so
Thus, ,,, and satisfy the conditions of Theorem 3.1, and there exists at least a positive solution of the above problem.
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Acknowledgments
This work is sponsored by the NSFC (no. 11061030), NSFC (no. 11026060), and nwnu-kjcxgc-03-69, 03-61.
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Han, X., Gao, H. & Xu, J. Existence of Positive Solutions for Nonlocal Fourth-Order Boundary Value Problem with Variable Parameter. Fixed Point Theory Appl 2011, 604046 (2011). https://doi.org/10.1155/2011/604046
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DOI: https://doi.org/10.1155/2011/604046