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Some fractional proportional integral inequalities
Journal of Inequalities and Applications volume 2019, Article number: 244 (2019)
Abstract
In the last few years, various researchers studied the so-called conformable integrals and derivatives. Based on that notion some authors used modified conformable derivatives (proportional derivatives) to generate nonlocal fractional integrals and derivatives, called fractional proportional integrals and derivatives, which contain exponential functions in their kernels. Our aim in this paper is to establish some new integral inequalities by utilizing the fractional proportional-integral operators. In fact, certain new classes of integral inequalities for a class of n (\(n\in \mathbb{N}\)) positive continuous and decreasing functions on \([a,b]\) are presented. The inequalities presented in this paper are more general than the existing classical inequalities.
1 Introduction
Fractional calculus is the generalization of derivatives and integrals of arbitrary non-integer order. This field has earned more recognition due to its applications in diverse domains [11, 18, 25]. Recent research has focused on developing a number of fractional integral operators and their applications in multiple disciplines of sciences. In [17], the authors introduced the idea of fractional conformable derivative operators with a shortcoming that the new derivative operator does not tend to the original function when the order \(\rho \rightarrow 0\). In [3] the authors studied certain various properties of the fractional conformable derivative operator and raised the problem of how to use conformable derivative operators to generate more general types of fractional derivative operators. Later on, in [8], Anderson and Ulness improved the idea of the fractional conformable derivative by introducing the idea of local derivatives. In [4, 5, 7, 9, 19], some researchers defined new fractional derivative operators by using exponential and Mittag-Leffler functions in the kernels. In [16], Jarad et al. introduced the left and right generalized proportional-integral operators which are respectively defined by
and
where \(\mu \in (0,1]\) and \(\beta \in \mathbb{C}\) and \(\Re (\beta )>0\) and Γ is the well-known gamma function.
Remark
If we consider \(\mu =1\) in (1.1) and (1.2), then we get the left and right Riemann–Liouville which are respectively defined as
and
where \(\beta \in \mathbb{C}\) and \(\Re (\beta )>0\).
Such type of generalizations promotes future research to establish more new ideas to unify the fractional derivative and integral operators and obtain fractional integral inequalities via such generalized fractional derivative and integral operators. Integral inequalities and their applications play a vital role in the theory of differential equations and applied mathematics. A variety of various types of some classical integral inequalities and their generalizations have been established by utilizing the classical fractional integral, fractional derivative operators and their generalizations are found in [12, 13, 22, 23, 28, 31, 32]. A Gronwall inequality and the Minkowski inequalities via generalized proportional fractional derivative and fractional integral are found in the recent work of Alzabut et al. and Rahman et al. [6, 29]. The Minkowski’s inequality for the AB-fractional integral operator is found in [15].
In [30], Sarikaya and Budak studied the \((k, s)\)-Riemann–Liouville fractional integral and applications.
In [24], generalized Hermite–Hadamard type inequalities via fractional integral operators are found. In [2], Agarwal et al. introduced Hermite–Hadamard type inequalities by employing the k-fractional integrals operators. In [14], Dahmani introduced certain classes of fractional integral inequalities by utilizing a family of n positive functions. In [1], the authors established fractional integral inequalities for a class of family of n (\(n\in \mathbb{N}\)) positive continuous and decreasing functions on \([a,b]\) by employing the \((k,s)\)-fractional integral operators. Recently the authors [10, 21, 26, 27] introduced various types of inequalities by employing the fractional conformable integrals.
2 Main results
In this section, we employ the left generalized proportional fractional integral operator to establish the generalization of some classical inequalities.
Theorem 2.1
Let g be a positive continuous and decreasing function on the interval \([a,b]\). Let \(a< x\leq b\), \(\vartheta >0\), \(\sigma \geq \gamma >0\). Then, for generalized proportional fractional integral operator (1.1), we have
where \(\mu \in (0,1]\), \(\beta \in \mathbb{C}\), and \(\Re (\beta )>0\).
Proof
Since g is a positive continuous and decreasing function on the interval \([a,b]\), we have
where \(a< x\leq b\), \(\vartheta >0\), \(\sigma \geq \gamma >0\), and \(t, \rho \in [a,x]\).
By (2.2), we have
Consider a function
We observe that the function \(\mathfrak{F}(x,t)\) remains positive for all \(t\in (a,x)\), \(a< x\leq b\), as each term of the above function is positive in view of conditions stated in Theorem 2.1. Therefore, multiplying (2.3) by \(\mathfrak{F}(x,t)g^{\gamma }(t)=\frac{1}{ \mu ^{\beta }\varGamma (\beta )}\exp [\frac{\mu -1}{\mu }(x-t)] (x-t)^{ \beta -1}g^{\gamma }(t)\), \(t\in (a,x)\), \(a< x\leq b\), we have
Integrating (2.5) with respect to t over \((a,x)\), we have
It follows that
Multiplying (2.7) by \(\mathfrak{F}(x,\rho )g^{\gamma }(\rho )=\frac{1}{ \mu ^{\beta }\varGamma (\beta )}\exp [\frac{\mu -1}{\mu }(x-\rho )] (x- \rho )^{\beta -1}g^{\gamma }(\rho )\), \(\rho \in (a,x)\), \(a< x\leq b\), and integrating the resultant identity with respect to ρ over \((a,x)\), we get
It follows that
Dividing the above equation by \({}_{a}\mathfrak{I}^{\beta ,\mu } [(x-a)^{ \vartheta }g^{\gamma }(x) ]{}_{a}\mathfrak{I}^{\beta ,\mu } [g^{\gamma }(x) ]\), we get the desired inequality (2.1). □
Remark
The inequality in Theorem 2.1 will reverse if g is an increasing function on the interval \([a,b]\).
Theorem 2.2
Let g be a positive continuous and decreasing function on the interval \([a,b]\). Let \(a< x\leq b\), \(\vartheta >0\), \(\sigma \geq \gamma >0\). Then, for generalized proportional fractional integral (1.1), we have
where \(\mu \in (0,1]\), \(\beta , \lambda \in \mathbb{C}\), \(\Re (\beta )>0\), and \(\Re (\lambda )>0\).
Proof
By multiplying both sides of (2.7) by \(\mathfrak{F}(x,\rho )g ^{\gamma }(\rho )=\frac{1}{\mu ^{\lambda }\varGamma (\lambda )}\exp [\frac{ \mu -1}{\mu }(x-\rho )] (x-\rho )^{\lambda -1}g^{\gamma }(\rho )\), \(\rho \in (a,x)\), \(a< x\leq b\), and integrating the resultant identity with respect to ρ over \((a,x)\), we have
Hence, dividing (2.9) by
completes the desired proof. □
Remark
Applying Theorem 2.2 for \(\beta =\lambda \), we get Theorem 2.1.
Theorem 2.3
Let g and h be positive continuous functions on the interval \([a,b]\) such that h is increasing and g is decreasing function on the interval \([a,b]\). Let \(a< x\leq b\), \(\vartheta >0\), \(\sigma \geq \gamma >0\). Then, for generalized proportional fractional integral (1.1), we have
where \(\mu \in (0,1]\), \(\beta \in \mathbb{C}\), and \(\Re (\beta )>0\).
Proof
Under the conditions stated in Theorem 2.3, we can write
where \(a< x\leq b\), \(\vartheta >0\), \(\sigma \geq \gamma >0\), and \(t, \rho \in [a,x]\).
From (2.11), we have
Multiplying both sides of (2.12) by \(\mathfrak{F}(x,t)g^{\gamma }(t)=\frac{1}{\mu ^{\beta }\varGamma (\beta )}\exp [\frac{\mu -1}{\mu }(x-t)] (x-t)^{\beta -1}g^{\gamma }(t)\), \(t\in (a,x)\), \(a< x\leq b\), where \(\mathfrak{F}(x,t)\) is defined by (2.4), we have
Integrating (2.13) with respect to t over \((a,x)\), we have
From (2.14), it can be written as
Again, multiplying (2.15) by \(\mathfrak{F}(x,\rho )g^{\gamma }( \rho )=\frac{1}{\mu ^{\beta }\varGamma (\beta )}\exp [\frac{\mu -1}{ \mu }(x-\rho )] (x-\rho )^{\beta -1}g^{\gamma }(\rho )\), \(\rho \in (a,x)\), \(a< x\leq b\), where \(\mathfrak{F}(x,\rho )\) is defined by (2.4), and integrating the resultant identity with respect to ρ over \((a,x)\), we get
which completes the desired inequality (2.10) of Theorem 2.3. □
Theorem 2.4
Let g and h be positive continuous functions on the interval \([a,b]\) such that h is increasing and g is decreasing function on the interval \([a,b]\). Let \(a< x\leq b\), \(\vartheta >0\), \(\sigma \geq \gamma >0\). Then, for generalized proportional fractional integral (1.1), we have
where \(\mu \in (0,1]\), \(\beta ,\lambda \in \mathbb{C}\), \(\Re (\beta )>0\), and \(\Re (\lambda )>0\).
Proof
Multiplying (2.15) by \(\mathfrak{F}(x,\rho )g^{\gamma }(\rho )=\frac{1}{ \mu ^{\lambda }\varGamma (\lambda )}\exp [\frac{\mu -1}{\mu }(x-\rho )] (x- \rho )^{\lambda -1}g^{\gamma }(\rho )\), \(\rho \in (a,x)\), \(a< x\leq b\), where \(\mathfrak{F}(x,\rho )\) is defined by (2.4), and integrating the resultant identity with respect to ρ over \((a,x)\), we get
It follows that
Dividing both sides by
gives the desired inequality (2.32). □
Remark
Applying Theorem 2.4 for \(\beta =\lambda \), we get Theorem 2.3.
Now, we use the left generalized proportional fractional integral operator to establish some inequalities for a class of n-decreasing positive functions.
Theorem 2.5
Let \((g_{j})_{j=1,2,3,\ldots,n}\) be n positive continuous and decreasing functions on the interval \([a,b]\). Let \(a< x\leq b\), \(\vartheta >0\), \(\sigma \geq \gamma _{p}>0\) for any fixed \(p\in \{1,2,3,\ldots,n\}\). Then, for generalized proportional fractional integral operator (1.1), we have
where \(\mu \in (0,1]\), \(\beta \in \mathbb{C}\), and \(\Re (\beta )>0\).
Proof
Since \((g_{j})_{j=1,2,3,\ldots,n}\) are n positive continuous and decreasing functions on the interval \([a,b]\), we have
for any fixed \(p\in \{1,2,3,\ldots,n\}\), \(a< x\leq b\), \(\vartheta >0\), \(\sigma \geq \gamma _{p}>0\), and \(t,\rho \in [a,x]\). By (2.18), we have
Multiplying both sides of (2.19) by \(\mathfrak{F}(x,t)\prod_{j=1} ^{n}g_{j}^{\gamma _{j}}(t)=\frac{1}{\mu ^{\beta }\varGamma (\beta )}\exp [\frac{ \mu -1}{\mu }(x-t)] (x-t)^{\beta -1} \prod_{j=1}^{n}g_{j}^{\gamma _{j}}(t)\), \(t\in (a,x)\), \(a< x\leq b\), where \(\mathfrak{F}(x,t)\) is defined by (2.4), we have
Integrating (2.20) with respect to t over \((a,x)\), we have
From (2.21), it follows that
Again, multiplying both sides of (2.22) by \(\mathfrak{F}(x, \rho )\prod_{j=1}^{n}g_{j}^{\gamma _{j}}(\rho )=\frac{1}{\mu ^{\beta } \varGamma (\beta )}\exp [\frac{\mu -1}{\mu }(x-\rho )] (x-\rho )^{\beta -1}\prod_{j=1}^{n}g_{j}^{\gamma _{j}}(\rho )\), \(\rho \in (a,x)\), \(a< x \leq b\), where \(\mathfrak{F}(x,\rho )\) is defined by (2.4), and integrating the resultant identity with respect to ρ over \((a,x)\), we get
which completes the desired inequality (2.17). □
Remark
The inequality in Theorem 2.5 will reverse if \((g_{j})_{j=1,2,3,\ldots,n}\) are increasing functions on the interval \([a,b]\).
Theorem 2.6
Let \((g_{j})_{j=1,2,3,\ldots,n}\) be n positive continuous and decreasing functions on the interval \([a,b]\). Let \(a< x\leq b\), \(\vartheta >0\), \(\sigma \geq \gamma _{p}>0\) for any fixed \(p\in \{1,2,3,\ldots,n\}\). Then, for generalized proportional fractional integral (1.1), we have
where \(\mu \in (0,1]\), \(\beta ,\lambda \in \mathbb{C}\), \(\Re (\beta )>0 \), and \(\Re (\lambda )>0\).
Proof
Multiplying both sides of (2.22) by \(\mathfrak{F}(x,\rho ) \prod_{j=1}^{n}g_{j}^{\gamma _{j}}(\rho )=\frac{1}{\mu ^{\lambda } \varGamma (\lambda )}\exp [\frac{\mu -1}{\mu }(x-\rho )] (x-\rho )^{ \lambda -1}\prod_{j=1}^{n}g_{j}^{\gamma _{j}}(\rho )\), \(\rho \in (a,x)\), \(a< x\leq b\), where \(\mathfrak{F}(x,\rho )\) is defined by (2.4), and integrating the resultant identity with respect to ρ over \((a,x)\), we get
It follows that
Hence, dividing (2.25) by
completes the desired proof. □
Remark
Applying Theorem 2.6 for \(\beta =\lambda \), we get Theorem 2.5.
Theorem 2.7
Let \((g_{j})_{j=1,2,3,\ldots,n}\) and h be positive continuous functions on the interval \([a,b]\) such that h is increasing and \((g_{j})_{j=1,2,3,\ldots,n}\) are decreasing functions on the interval \([a,b]\). Let \(a< x\leq b\), \(\vartheta >0\), \(\sigma \geq \gamma _{p}>0\) for any fixed \(p\in \{1,2,3,\ldots,n\}\). Then, for generalized proportional fractional integral (1.1), we have
where \(\mu \in (0,1]\), \(\beta \in \mathbb{C}\), and \(\Re (\beta )>0\).
Proof
Under the conditions stated in Theorem 2.7, we can write
for any fixed \(p\in \{1,2,3,\ldots,n\}\), \(a< x\leq b\), \(\vartheta >0\), \(\sigma \geq \gamma _{p}>0\), and \(t,\rho \in [a,x]\).
From (2.27), we have
Multiplying (2.28) by \(\mathfrak{F}(x,t)\prod_{j=1}^{n}g_{j} ^{\gamma _{j}}(t)=\frac{1}{\mu ^{\beta }\varGamma (\beta )}\exp [\frac{ \mu -1}{\mu }(x-t)] (x-t)^{\beta -1}\prod_{j=1}^{n}g_{j}^{\gamma _{j}}(t)\), \(t\in (a,x)\), \(a< x\leq b\), where \(\mathfrak{F}(x,t)\) is defined by (2.4), we have
Integrating (2.29) with respect to t over \((a,x)\), we have
From (2.30), we can write
Again, multiplying (2.31) by \(\mathfrak{F}(x,\rho )\prod_{j=1} ^{n}g_{j}^{\gamma _{j}}(\rho )=\frac{1}{\mu ^{\beta }\varGamma (\beta )} \exp [\frac{\mu -1}{\mu }(x-\rho )] (x-\rho )^{\beta -1}\times \prod_{j=1} ^{n}g_{j}^{\gamma _{j}}(\rho )\), \(\rho \in (a,x)\), \(a< x\leq b\), where \(\mathfrak{F}(x,\rho )\) is defined by (2.4) and integrating the resultant identity with respect to ρ over \((a,x)\), we get
which completes the desired inequality (2.26) of Theorem 2.7. □
Theorem 2.8
Let \((g_{j})_{j=1,2,3,\ldots,n}\) and h be positive continuous functions on the interval \([a,b]\) such that h is increasing and \((g_{j})_{j=1,2,3,\ldots,n}\) are decreasing functions on the interval \([a,b]\). Let \(a< x\leq b\), \(\vartheta >0\), \(\sigma \geq \gamma _{p}>0\) for any fixed \(p\in \{1,2,3,\ldots,n\}\). Then, for generalized proportional fractional integral (1.1), we have
where \(\mu \in (0,1]\), \(\beta , \lambda \in \mathbb{C}\), \(\Re (\beta )>0\), and \(\Re (\lambda )>0\).
Proof
Multiplying (2.31) by \(\mathfrak{F}(x,\rho )\prod_{j=1}^{n}g _{j}^{\gamma _{j}}(\rho )=\frac{1}{\mu ^{\lambda }\varGamma (\lambda )} \exp [\frac{\mu -1}{\mu }(x-\rho )] (x-\rho )^{\lambda -1}\times \prod_{j=1} ^{n}g_{j}^{\gamma _{j}}(\rho )\), \(\rho \in (a,x)\), \(a< x\leq b\), where \(\mathfrak{F}(x,\rho )\) is defined by (2.4), and integrating the resultant identity with respect to ρ over \((a,x)\), we get
It follows that
Dividing both sides by
gives the desired inequality (2.32). □
Remark
Applying Theorem 2.8 for \(\beta =\lambda \), we get Theorem 2.7.
Remark
Similarly, we can establish the inequalities for the right generalized proportional fractional integral defined by (1.4).
3 Concluding remarks
In this present paper, we established certain inequalities by employing the left generalized proportional fractional integral operator. Also, some inequalities for a class of n positive continuous and decreasing functions on the interval \([a,b]\) are presented. In [20], Liu et al. introduced interesting integral inequalities for continuous functions on \([a,b]\). Later on, Dahmani [14] generalized the work of [20] involving the Riemann–Liouville fractional integral operators. Recently, Jarad et al. [16] introduced Caputo and Riemann–Liouville generalized proportional fractional derivatives which comprise exponential functions in their kernels. They proved that the newly defined proportional fractional integrals possess a semi-group property and they provide an undeviating generalization to the existing Caputo and Riemann–Liouville fractional derivatives and integrals. Therefore the inequalities obtained in this paper are the generalization of integral inequalities involving the Riemann–Liouville fractional integral operators. If we consider \(\mu =1\), then the inequalities obtained in this paper will reduce to the integral inequalities involving the Riemann–Liouville fractional integral operators introduced by Dahmani [14]. Some of the special cases of our main results are found in [20]. The results obtained in this paper give some contributions towards the theory of integral inequalities and fractional calculus and are expected to lead to some applications for establishing the uniqueness of solutions in generalized proportional fractional differential equations. Also, as an application, we will try to find the analytical solutions of some space-time conformable fractional differential equations using a different method in our future papers.
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The second author would like to thank Prince Sultan University for funding this work through research group Nonlinear Analysis Methods in Applied Mathematics (NAMAM) group number RG-DES-2017-01-17.
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Rahman, G., Abdeljawad, T., Khan, A. et al. Some fractional proportional integral inequalities. J Inequal Appl 2019, 244 (2019). https://doi.org/10.1186/s13660-019-2199-z
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DOI: https://doi.org/10.1186/s13660-019-2199-z