1 Introduction

In this paper,we consider the nonexistence of the positive solution for the following boundary value problem of differential equation involving the Caputo’s fractional order derivative

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where 1＜α≤2,0≤ξ≤η≤1,0≤µ1,µ2≤1 and satisfy the following conditions:

Due to the development of the theory of fractional calculus and its applications,such as in the fields of physics,electro-dynamics of complex medium,control theory,Bode’s analysis of feedback amplifiers,blood flow phenomena,aerodynamics and polymer rheology,electron-analytical chemistry,etc,many works on fractional calculus,fractional order differential equations have appeared[1-7].Recently,there have been many results concerning the solutions and positive solutions for boundary value problems for nonlinear fractional differential equations,see[8-29]and references therein.

For example,Bai and L¨u[12]considered the following Dirichlet boundary value problem of fractional differential equation

By means of different fixed-point theorems on a cone,some existence and multiplicity results of positive solutions were obtained.Jiang and Yuan[20]improved the results in[12]by discussing some new positive properties of the Green function for problem(1.3).By using the fixed point theorem on a cone due to Krasnoselskii,the authors established the existence results of positive solution for problem(1.3).Recently,Caballero et al.[21]obtained the existence and uniqueness of positive solution for singular boundary value problem(1.3).The existence results were established in the case that the nonlinear term f may be singular at t=0.

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Wang et al.[25]considered the boundary value problem of fractional differential equation with integral condition

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Let the Banach space E=C[0,1]be endowed with the norm

Yang and Zhang[29]considered the positive solution for the following boundary value problem of differential equation involving the Caputo’s fractional order derivative

where 1＜α≤2,0≤ξ≤η≤1,0≤µ1,µ2≤1 with the condition

and f:[0,1]×R+ → R+is continuous.By using fixed-point theorems and successive iteration method,the authors established the existence results of at least one positive solution for this problem.

Many works deal with the existence and multiplicity of positive solution for fractional differential equation(1.1)under the boundary conditions(1.2).Zhao,Chai and Ge[28]considered a class of four-point fractional boundary value problem of the form

Denote

where 1＜α≤2,0≤ξ≤η≤1,0≤µ1,µ2≤1.By using the Avery-Peterson fixed point theorem,the existence of at least three positive solutions were established.

To complement the work on the positive solutions of problem(1.1)with(1.2),in this paper we consider the nonexistence of positive solution for problem(1.1)with(1.2).Sufficient conditions on the nonlinear term f and the explicit ranges of parameter λ,under which problem(1.1)with(1.2)has no positive solution,are given in Section 3.Some examples are presented in Section 4 to illustrate the main results.

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2 Preliminary Results

Definition 2.1 The Riemann-Liouville fractional integral of order α＞0 of a function u:(0,∞)→ R is given by

provided the right side is point-wise defined on(0,∞).

Definition 2.2 The Caputo’s fractional derivative of order α ＞ 0 of a continuous function u:(0,∞)→ R is given by

ProofFrom the definitions of ,and the condition,＜∞,there exists an M1＞0 such that

Lemma 2.1 Let α＞0.Then

3 Main Results

Lemma 3.1[28]Given y(t)∈C[0,1].Then following FBVPs

is equivalent to an operator equation

where

Lemma 3.2[28]Let G(t,s)be given as in the statement of Lemma 3.1.Then we find that

(1)G(t,s)is a continuous function on the unit square[0,1]×[0,1];

(2)G(t,s)≥0 for each(t,s)∈[0,1]×[0,1];

(3)G(t,s)≤ M(1−s)α−2,s∈ (0,1);

There are also some results concerning multi-point boundary value problems for differential equations of fractional order.

(4)there is a positive constant γ0 ∈ (0,1)such that

where

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Here we introduce the following extreme limits:

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where α ＞ 2, u(s)dA(s)was given by Riemann-Stieltjes integral with a signed measure.By using the fixed point theorem,the existence of positive solution for this problem were established.

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We define a cone K⊂E by

Lemma 3.3 Let T:K→E be an operator defined by

Then T:K→K is completely continuous.

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Proof The operator T:K→E is continuous in view of the continuity of the functions G(t,s)and f(t,u(t),u′(t)).Let Ω ⊂ K be bounded.Then there exists a positive constant R1＞0 such that‖u‖≤R1,u∈Ω.

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Then for u∈Ω,we have

Hence T(Ω)is bounded.For u∈ Ω,t1,t2∈ [0,1],one has

Thus,

By means of the Arzela-Ascoli theorem,we claim that T is completely continuous.Finally,we see that

Thus,we show that T:K→K is a completely continuous operator.

Theorem 3.1 If,＜∞,then there exists a positive constant λ0such that for every λ ∈ (0,λ0),the boundary value problem(1.1)with(1.2)has no positive solution.

where n−1＜α≤n,provided that the right side is point-wise defined on(0,∞).

De fine a positive constant

Let λ ∈ (0,λ0),then we suppose that problem(1.1)with(1.2)has a positive solution u(t),t∈[0,1].Thus,

Therefore,

which is a contradiction.So the boundary value problem(1.1)with(1.2)has no positive solution.

Theorem 3.2 If ,＞0,then there exists a positive constantsuch that for every λ ＞ ,the boundary value problem(1.1)with(1.2)has no positive solution.

ProofFrom the definitions ofand ,there exists a positive number m1 such that

Define a positive constant

Let λ＞,and suppose that problem(1.1)with(1.2)has a positive solution u(t),t∈ [0,1].Then for t∈ ,we have

Thus,

which is a contradiction.So the boundary value problem(1.1)with(1.2)has no positive solution.

4 Example

Consider a nonlinear FBVPs

where α =1.8,

and

By simple computation,we have

From Theorem 3.1,for every λ ∈ (0,λ0),problem(4.1)with(4.2)has no positive solution.From Theorem 3.2,for every λ＞,problem(4.1)with(4.2)has no positive solution.

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