Abstract
The primary goal of this research is to prove some new Hardy-type ∇-conformable dynamic inequalities by employing product rule, integration by parts, chain rule and -nabla Hölder inequality on time scales. The inequalities proved here extend and generalize existing results in the literature. Further, in the case when , we obtain some well-known time scale inequalities due to Hardy inequalities. Many special cases of the proposed results are obtained and analyzed such as new conformable fractional h-sum inequalities, new conformable fractional q-sum inequalities and new classical conformable fractional integral inequalities.
Keywords:
conformable derivative; time scales; Hardy’s inequality; (γ,a)-nabla Hölder inequality on timescales MSC:
26D15; 26E70
1. Introduction
Over several decades Hardy-type inequalities have been attracted many researchers and several refinements and extensions have been done to the previous results, we refer the reader to the works [1,2,3,4] and also the book [5].
Hardy [6] proved that.
Theorem 1.
If a sequenceis real valued. If, we get
Hardy [7] proved the continuous version of (1).
Theorem 2.
Copson [8] proved variant discrete version of Hardy inequality.
Theorem 3.
Let a sequencebe real valued nonnegative. For, we have
Renaud [9] proved the reverse versions of inequality (3).
Theorem 4.
Assumeis a nonnegative and nonincreasing sequence of real numbers. If, we get
Furthermore, he proved the following inequalities:
In [10,11,12,13,14] many authors have studied many new dynamic inequalities. Řehák [14] is the first author proved the version of Hardy inequality on time scales that unifies (1) and (2).
Theorem 5.
Suppose the time scale, with. If, then
unless.
In [15] the authors extended (6) on genera time scales as follows: If ,
El-Deeb et al. [16] generalized (8) that unify (4) and (5). If and , we get
where
Furthermore, in 2020, El-Deeb et al. [17] proved that if such that and , where
with , and , then
In [1,3,4,5], several authors proved many new inequalities. See also [18,19].
In [19], the authors proved:
Lemma 1
([20], -nabla Hölder inequality on timescales). Let where . If and , then
where and . This inequality is reversed if and if or .
In this work, we prove and extend some new Hardy’s inequality obtained in [15,16,17] to a standard time scale and set up numerous new sharpened types of fractional conformable ∇-integral of order on time scales. As a new work, we generalize the inequalities presented in those papers. New discrete Hardy’s inequalities maybe proved by our results via conformable fractional on time scales.
2. Preliminaries
In PhD thesis of S. Hilger initiated the theory of time scale. This subject has since gained tremendous attention among many mathematician. It combines the continuous and discrete branch of mathematics into one theory [21]. In [11,22], the authors stated all basic rules and definitions regarding to the calculus of time scales. Most of the fractional analysis concepts maybe found in [11,22,23,24]. Suppose , is forward jump operator
and is forward graininess function.
In [25], Bendouma et al. presenred a new version of the nabla fractional derivative on timescales. Given there is a - neighborhood of such that
for all We define the nabla fractional integral as
By using for , , Rahmat et al. [23] presented nabla derivative conformable which generalizes the claim in [26].
Definition 1.
Supposeand, is presented as the generalized time scale power function by
with inverse
We use the conventionfor all
Definition 2
(Conformable nabla derivative). Suppose ℧ is ∇ differentiable at and let it be nable differentiable at ℘, and its ∇ derivative is given by
since as defined in (12). Suppose exists in then
suppose the existence of .
We have is differentiable with
Lemma 2
(Integration by parts). Suppose that where If ξ are conformable - nabla fractional differentiable and then:
If , we have
Furthermore, we have
and for
With , if , we have h-sum given by
For we get
3. Main Results
In this section, we assume that is unbounded above.
Theorem 6.
Letbe time scale for, and. Further, assume the rd-continuous functions v, r, g, ℧, k,, onwith k is nondecreasing. Further, suppose we have: and, where
Ifand, then
Proof.
Using (15) with
we have
where we assumed that
Applying (16), (14), and the hypothesis , we have with
Since , and , we get
This gives us that
Hence
Applying (14) and (16), we have with
Since , , , and , we have
From (21)–(23), with and we have
or equivalently,
Applying (11) with index p and index , we obtain
which implies that
We get our claim. □
Remark 1.
If one putin Theorem 6, then we get the following inequality
Corollary 1.
When one putin (21) we get
where
Corollary 2.
Forin (21) we obtain
where
Corollary 3.
Ifwithin our Corollary 16 we have from (21) that
where
Corollary 4.
Forin (21) we obtain
where
Theorem 7.
Supposeis a time scale withand. Furthermore, suppose the rd-continuous functions w, k, ℧, g, r,onwith k nonincreasing. Furthermore, assume we havewithand, where
If and , then
Proof.
Applying (15), we get
where
Applying (16), (14), and the assumption , we have with
As , and , we get
which implies
Therefore
Utilizing (14) and (16), we have with
Since , , , and , we get
From (25)–(27), with and we obtain
which is equivalent to
Applying (11) with the index p and the index , obtains
This leads to
which is our claim. □
Remark 2.
In Theorem 7, if we takethen we get the following inequality
Corollary 5.
Corollary 6.
Corollary 7.
Corollary 8.
Theorem 8.
Letbe a time scale with, and. Furthermore, assume the rd-continuous functions v, g, r, ℧, k,, on with k nondecreasing. Further, suppose we havewithand, where
If , , then
Proof.
Applying (15) with
we have
where
From (16), (14), and the assumption , we have
Because , and , we get
Thus
Hence
Applying (14) and (16), we have with
Considering , , , and , we get
Combining (29)–(31), with and obtains
The last inequality can be rewritten as
Applying (11) with the index p and the index , gets
This implies that
This concludes our result. □
Remark 3.
Putting in our result Theorem 8, then we get the following inequality
Corollary 9.
Corollary 10.
Corollary 11.
Corollary 12.
Theorem 9.
Assume is a time scale with , and . In addition, let the rd-continuous functions g, v, r, ℧, k, , on with k nonincreasing. Moreover, suppose there exist such that and , where
If and , then
Proof.
Applying (15), obtains
where
Using (16), (14), and the hypothesis , we obtain
Since , and , we get
This gives us that
Therefore
Employing (14) and (16), one have with
As , , , and , we have
Combining (33), (34) and (35), we obtain (note that and )
or equivalently,
Applying the dynamic Hölder inequality (11) with the index p and the index , obtains
which implies
that is our required inequality. □
Remark 4.
In our result Theorem 9, puttingthen we get the following inequality
Corollary 13.
Corollary 14.
Corollary 15.
Corollary 16.
4. Conclusions
In this manuscript, by employing ∇-integral fractional of order , many ∇ inequalities Hardy-type are introduced. For the sake of completeness, we applied the main results to some nonuniform time scales.
Author Contributions
Conceptualization, resources and methodology, A.A.E.-D. and S.D.M.; investigation, supervision, J.A.; data curation, S.S.A.; writing—original draft preparation, A.A.E.-D.; writing—review and editing, J.A.; project administration, A.A.E.-D. and S.D.M. All authors read and agreed to the published version of the manuscript.
Funding
This research received no external funding.
Institutional Review Board Statement
Not applicable.
Informed Consent Statement
Not applicable.
Data Availability Statement
Not applicable.
Acknowledgments
The authors extend their appreciation to the Research Supporting Project number (RSP-2022/167), King Saud University, Riyadh, Saudi Arabia.
Conflicts of Interest
The authors declare no conflict of interest.
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