Abstract
Motivated by certain results known from the literature, in this paper we give several new dynamic inequalities for B-monotone functions with respect to time scales nabla calculus. If the time scale represents the set of real numbers, our results reduce to integral inequalities known from the literature. On the other hand, in the setting of positive integers, we obtain new discrete inequalities for B-monotone sequences.
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1 Introduction
In [16] Heinig and Maligranda showed that for \(\omega \geq 0 \), which is decreasing on \((\iota ,\varrho )\), and \(\Theta \geq 0 \), which is increasing on \((\iota ,\varrho )\), with \(\Theta (\iota )=0\), \(-\infty \leq \iota <\varrho \leq \infty \), the inequality
holds for every \(\gamma \in (0,1]\), while for \(1\leq \gamma <\infty \) the inequality is reversed. It has been also showed that if ω is increasing on \((\iota ,\varrho )\) and Θ is decreasing on \((\iota ,\varrho )\) with \(\Theta (\varrho )=0\), then the inequality
holds, where \(\gamma \in (0,1]\). In the same paper, Heinig and Maligranda showed that if \(0< p\leq q<\infty \), and u, v are nonnegative functions, then \(\exists D>0\) such that
for a nonnegative decreasing function ω iff
In addition, they showed that inequality (3) holds for all nonnegative increasing functions ω and \(0< p\leq q<\infty \) iff
In 1997, Pečarić et al. [19] extended the results from [16] to the case of B-monotone functions. Recall that if \(s\leq \aleph \) implies \(\omega (\aleph )\leq B\omega (s)\) for all \(s, \aleph \in [\iota , \varrho ]\), then ω is a B-decreasing function on \([\iota , \varrho ]\). On the other hand, if \(s\leq \aleph \) implies \(\omega (s)\leq B\omega (\aleph )\), \(s, \aleph \in [\iota , \varrho ]\), then ω is B-increasing. Clearly, if \(B=1\), then the notion of B-monotonicity reduces to the usual monotonicity.
Pečarić et al. [19] showed that if \(\varpi :[0,\infty )\rightarrow \mathbb{R}\) is a concave, nonnegative, and differentiable function such that \(\varpi (0)=0\), ω is B-decreasing, \(B\geq 1\), and Θ is increasing on \([\iota , \varrho ]\), such that \(\Theta (\iota )=0\), then the inequality
holds. In addition, if ω is B-increasing with \(B\geq 1\) and Θ is increasing on \([\iota , \varrho ]\) such that \(\Theta (\iota )=0\), then the inequality
holds. Analogous results have been derived for the case of a decreasing function Θ. More precisely, if ω is B-increasing, \(B\geq 1\), and Θ is decreasing on \([\iota , \varrho ]\) with \(\Theta (\varrho )=0\), then the inequality
holds, while for a B-decreasing function ω, \(B\geq 1\), and a decreasing function Θ such that \(\Theta (\varrho )=0\), one has the inequality
Hilger in his seminal work [17] introduced the time scale theory and established a new dynamic inequality with a general domain called a time scale \(\mathbb{T}\). For the dynamic inequalities, see monographs [1, 2, 9], as well as papers [3, 5–8, 11–14, 18, 20–27].
In [24], Saker et al. introduced the inequalities (4)–(7) on time scales. More precisely, the time scale variant of (4) asserts that if ω is B-decreasing on \([\iota , \varrho ]_{\mathbb{T}}\), \(B\geq 1\), and Θ is increasing on \([\iota , \varrho ]_{\mathbb{T}}\) with \(\Theta (\iota )=0\), then
where \([\iota , \varrho ]_{\mathbb{T}}\) stands for \([\iota , \varrho ]\cap \mathbb{T}\). Similarly, the time scale analogue of (5) asserts that if ω is B-increasing on \([\iota , \varrho ]_{\mathbb{T}}\), \(B\geq 1\), and Θ is increasing on \([\iota , \varrho ]_{\mathbb{T}}\) with \(\Theta (\iota )=0\), then
In [24], one can also find time scale variants of the inequalities (6) and (7).
This paper seeks to extend inequalities (1), (2), and (4)–(7) via the time scales nabla calculus. We will introduce the difference between the results (8) and (9) on delta calculus in [24] and the nabla calculus. In particular, we will employ the corresponding chain rule formula, as well as the basic properties of B-monotone functions. Of course, the results that we will derive contain classical results and the usual monotonicity.
The paper is structured as follows: Sect. 2 involves the basic definitions and properties on time scales that will be important in proving our main results. Section 3 contains the extended inequalities (1), (2), and (4)–(7) via the time scales nabla calculus. It turns out that if \(\mathbb{T}=\mathbb{R}\), our results reduce to inequalities presented in this Introduction, while for \(\mathbb{T}=\mathbb{N} \), the obtained relations are new.
2 Basic lemmas
In this section, we present the basic notions and facts of nabla calculus. For a comprehensive insight of the time scales calculus, the reader is referred to the monographs [9, 10] by Bohner and Peterson.
The product and the quotient of nabla differentiable functions are also nabla differentiable functions. More precisely, if ω, \(\Theta : \mathbb{T\rightarrow R}\) are nabla differentiable at \(\aleph \in \mathbb{T}\), then
and
provided that \(\Theta (\aleph )\Theta ^{\rho }(\aleph )\neq 0\). For the proofs of the above properties, the reader is referred to [4]. The function \(\omega :\mathbb{T} \to \mathbb{R}\) is increasing (decreasing) if \(\omega ^{\nabla}(\varkappa )>0\), \(\varkappa \in \mathbb{T}\) (\(\omega ^{\nabla}(\varkappa )<0\), \(\varkappa \in \mathbb{T}\)).
On the other hand, the chain rule for the nabla derivative asserts that if \(\omega :\mathbb{R\rightarrow R}\) is continuously differentiable and \(\Theta : \mathbb{T\rightarrow R}\) is continuous and nabla differentiable, then \(\omega \circ \Theta :\mathbb{T\rightarrow R}\) is nabla differentiable and there exists \(d\in [\rho (\aleph ), \aleph ]\) such that
Relation (10) has been established in [15].
The properties of integration in nabla calculus state that if ι, ϱ, \(c\in \mathbb{T}\), α, \(\beta \in \mathbb{R}\) and ω, \(\Theta :\mathbb{T\rightarrow R}\) are ld-continuous, then
-
(i)
\(\int _{ \iota}^{\varrho} \left [ \alpha \omega (\aleph )+\beta \Theta (\aleph )\right ] \nabla \aleph =\alpha \int _{ \iota}^{\varrho} \omega ( \aleph )\nabla \aleph +\beta \int _{ \iota}^{\varrho} \Theta (\aleph ) \nabla \aleph \),
-
(ii)
\(\int _{ \iota}^{\varrho} \omega (\aleph )\nabla \aleph =-\int \nolimits _{\varrho}^{\iota}\omega (\aleph )\nabla \aleph \),
-
(iii)
\(\int \nolimits _{\iota}^{c}\omega (\aleph )\nabla \aleph =\int \nolimits _{\iota}^{\varrho}\omega (\aleph )\nabla \aleph +\int \nolimits _{\varrho}^{c}\omega (\aleph )\nabla \aleph \);
see [9, Theorem 8.47]. The properties of integration transformation on time scales to the analogue in continuous and discrete forms state that for \(\iota , \varrho \in \mathbb{T}\) and \(f : \mathbb{T} \to \mathbb{R}\mathbbm{,}\) which is ld-continuous, the following properties hold:
-
(i)
If \(\mathbb{T}=\mathbb{R}\), then \(\int _{ \iota}^{\varrho} f(\aleph ) \nabla \aleph =\int _{ \iota}^{ \varrho} f(\aleph ) d\aleph \).
-
(ii)
If \(\mathbb{T}=\mathbb{Z}\), then
$$\begin{aligned} \int _{ \iota}^{\varrho} f(\aleph ) \nabla \aleph = \textstyle\begin{cases} \sum _{t=\iota +1}^{\varrho} f(\aleph ) & \text{if} \ \iota < \varrho , \\ 0 &\text{if} \ \iota =\varrho , \\ -\sum _{t=\varrho +1}^{\iota} f(\aleph ) &\text{if} \ \iota < \varrho ; \end{cases}\displaystyle \end{aligned}$$
see [9, Theorem 8.48].
In addition, the integration by parts formula in nabla calculus asserts that
provided ω, \(\Theta :\mathbb{T\rightarrow R}\) are ld-continuous functions, see [9, Theorem 8.47].
3 Main results
If nothing else is explicitly stated, we assume that all the considered functions are nonnegative, ld-continuous, ∇-differentiable, and locally ∇-integrable on \([\iota ,\infty )_{\mathbb{T}}\). Furthermore, all the considered integrals are well defined.
In addition, throughout this section, \(\varpi :[0,\infty )\rightarrow \mathbb{R}\) is a nonnegative, concave, and differentiable function such that \(\varpi (0)=0\).
Now, we are ready to state and prove our main results. Our first results is an extension of inequalities (1) and (4) in the setting of time scales nabla calculus.
Theorem 1
Let \(\mathbb{T}\) be a time scale with \(\iota , \varrho \in \mathbb{T} \), and let ω be B-decreasing on \([\iota , \varrho ]_{\mathbb{T}}\), where \(B\geq 1\). If Θ is increasing on \([\iota , \varrho ]_{\mathbb{T}}\) and \(\Theta (\iota )=0\), then the following inequality holds:
Proof
Denoting
and
we get
Now, since ω is B-decreasing, it follows that \(\omega (\aleph )\leq B\omega (\varkappa )\), for \(\aleph \geq x\). Moreover, taking into account that Θ is increasing and \(\Theta (\iota )=0\), we obtain
On the other hand, applying (10) to \(\varpi \left ( \beth (\aleph )\right ) \), we see that there exists \(\zeta \in \lbrack \rho (\aleph ), \aleph ]\) such that
Now, since Θ is an increasing function, the definition of ℶ yields the relation
which implies that ℶ is increasing on \([\iota , \varrho ]_{\mathbb{T}}\) and, consequently, \(\beth (\zeta )\geq \beth ^{\rho }(\aleph )\), for \(\zeta \geq \rho (\aleph )\). In addition, since ϖ is concave on \([0,\infty )\), it follows that \(\varpi ^{\prime }\) is decreasing on \([0,\infty )\) and so
Taking into account (13)–(15), we arrive at the relation
Clearly, relation (12) implies the inequality \(\varpi ^{\prime }\left ( \beth ^{\rho }(\aleph )\right ) \leq \varpi ^{\prime }\left ( \omega ^{\rho }(\aleph )\Theta ^{\rho }( \aleph )\right )\), that is,
since ω is nonnegative and Θ is increasing. Hence, taking into account (16), we have that
Taking into account the definition of ϒ, it follows that
which, together with (17), yields \(\Upsilon ^{\nabla }(\aleph )\leq 0\). Consequently, ϒ is decreasing on \([\iota , \varrho ]_{\mathbb{T}}\) and \(\Upsilon (\varrho )\leq \Upsilon (\iota )\), since \(\varrho >\iota \).
Finally, since \(\varpi (0)=0\), we have that \(\Upsilon (\varrho )\leq \Upsilon (\iota )=\varpi (0)=0\), i.e.,
as claimed. The proof is now complete. □
Remark 1
In particular, if \(\mathbb{T}\mathbbm{=}\mathbb{R}\) and \(\rho (\varkappa )=\varkappa \), our Theorem 1 reduces to the integral inequality (4) proved by Pečarić et al. [19]. Moreover, if \(\mathbb{T}\mathbbm{=}\mathbb{R}\), \(B=1\), \(\varpi (\aleph )=\aleph ^{p}\), \(0< p\leq 1\), our inequality (11) becomes the integral inequality (1) proved by Heinig and Maligranda in [16].
Remark 2
Considering Theorem 1 applied to \(\mathbb{T}\mathbbm{=}\mathbb{N}_{0}\) and \(\iota =0\), we obtain the following discrete inequality:
Remark 3
Considering Theorem 1 applied to \(\mathbb{T}=q^{\mathbb{N}_{0}}\) for \(q>1\), we obtain the following discrete inequality:
Our next result is a dynamic extension of the integral inequality (5) due to Pečarić et al. [19].
Theorem 2
Let \(\iota , \varrho \in \mathbb{T} \), and let ω be B-increasing on \([\iota , \varrho ]_{\mathbb{T}}\), where \(B\geq 1\). If Θ is increasing on \([\iota , \varrho ]_{\mathbb{T}}\) and \(\Theta (\iota )=0\), then the inequality
holds.
Proof
Let
and
that is,
Since ω is B-increasing, we observe that \(\omega (\varkappa )\leq B\omega (\aleph )\), for \(x \leq \aleph \). Furthermore, having in mind that Θ is increasing and \(\Theta (\iota )=0\), it follows that
which yields the relation
due to the definition of the function ℶ.
On the other hand, using (10) to \(\varpi \left ( \beth (\aleph )\right ) \), it follows that there exists \(\zeta \in \lbrack \rho (\aleph ), \aleph ]\) such that
Clearly, since Θ is increasing, we have that
which means that \(\beth (\aleph )\) is increasing on \([\iota , \varrho ]_{\mathbb{T}}\). Consequently, if \(\zeta \leq \aleph \), then \(\beth (\zeta )\leq \beth (\aleph )\), and so
due to the concavity of function ϖ. Now, taking into account (21)–(23), we get
In addition, by virtue of (20), we have that \(\varpi ^{\prime }( \beth (\aleph )) \geq \varpi ^{\prime }( \omega ( \aleph )\Theta (\aleph ))\), and so (note that ω is nonnegative and Θ is increasing)
which, together with (24), yields the relation
Now, taking into account (19), we obtain
and, consequently, \(\Upsilon ^{\nabla}(\aleph )\geq 0\), due to the previous inequality.
This means that ϒ is increasing and so \(\Upsilon (\varrho )\geq \Upsilon (\iota )=\varpi (0)=0\), i.e.,
which represents (18). □
Remark 4
If \(\mathbb{T}\mathbbm{=}\mathbb{R}\mathbbm{,}\) our Theorem 2 reduces to the integral inequality (5) established by Pečarić et al. [19], while for \(\mathbb{T}\mathbbm{=}\mathbb{N}_{0}\) and \(\iota =0\), inequality (18) can be rewritten in the following form:
Remark 5
Considering Theorem 2 applied to \(\mathbb{T}=q^{\mathbb{N}_{0}}\) for \(q>1\), we obtain the following discrete inequality:
In the sequel, we establish time scales versions of the integral inequalities (2) and (6) from the Introduction.
Theorem 3
Let \(\iota , \varrho \in \mathbb{\ T}\), ω be B-increasing on \([\iota , \varrho ]_{\mathbb{T}}\), \(B\geq 1\), and let Θ be decreasing on \([\iota , \varrho ]_{\mathbb{T}}\). If \(\Theta (\varrho )=0\), then the inequality
holds.
Proof
Let
where
It is easy to see that
Namely, since ω is B-increasing and Θ is decreasing with \(\Theta (\varrho )=0\), we have that
so assertion (26) holds.
Now, by virtue of the chain rule (10), there exists \(\zeta \in \lbrack \rho (\aleph ), \aleph ]\) such that
Clearly, \(\beth ^{\ast }\) is decreasing on \([\iota , \varrho ]_{\mathbb{T}}\) since \(\left [ \beth ^{\ast }(\aleph )\right ] ^{\nabla }=B\omega (\aleph ) \Theta ^{\nabla }(\aleph )\leq 0 \), which, together with the concavity of function ϖ, implies the relation
provided that \(\zeta \leq \aleph \). Therefore, relations (27) and (28) imply the inequality
On the other hand, taking into account (26), we have that \(\varpi ^{\prime }( \beth ^{\ast }(\aleph )) \leq \varpi ^{\prime }( \omega (\aleph )\Theta (\aleph ))\), and so
that is,
due to (29).
Finally, since \(\Upsilon ^{\nabla }(\aleph )=-\varpi ^{\nabla }( \beth ^{\ast }( \aleph )) +B\omega (\aleph )\Theta ^{\nabla }(\aleph )\varpi ^{ \prime }[ \omega (\aleph )\Theta (\aleph )] \), taking into account (30), it follows that \(\Upsilon ^{\nabla }(\aleph )\leq 0 \), i.e., ϒ is decreasing on \([\iota , \varrho ]_{\mathbb{T}}\). Consequently, we have that \(\Upsilon (\iota )\geq \Upsilon (\varrho )=-\varpi (0)=0\), that is,
which represents (25), as claimed. □
Remark 6
If \(\mathbb{T}\mathbbm{=}\mathbb{R}\mathbbm{,}\) our Theorem 3 represents the inequality (6) proved by Pečarić et al. [19]. In addition, if \(B=1\), \(\varpi (\aleph )=\aleph ^{p}\), and \(0< p\leq 1\), we get (2) established by Heinig and Maligranda [16], while for \(\mathbb{T}\mathbbm{=}\mathbb{N}_{0}\) and \(\iota =0\), relation (25) reduces to the following discrete inequality:
Remark 7
Considering Theorem 3 applied to \(\mathbb{T}=q^{\mathbb{N}_{0}}\) for \(q>1\), we obtain the following discrete inequality:
In order to conclude our discussion, it remains to give a dynamic extension of the inequality (7).
Theorem 4
Let \(\iota , \varrho \in \mathbb{T}\), ω be B-decreasing on \([\iota , \varrho ]_{\mathbb{T}}\), \(B\geq 1\), and let Θ be decreasing on \([\iota , \varrho ]_{\mathbb{T}}\). Then the inequality
holds, provided that \(\Theta (\varrho )=0\).
Proof
Let
where
Since ω is B-decreasing, we have that
and so
Utilizing (10) to \(\varpi \left ( \beth ^{\ast }(\aleph )\right ) \), we conclude that there exists \(d\in \lbrack \rho (\aleph ), \aleph ]\) such that
It should be noticed here that \(\beth ^{\ast }\) is decreasing on \([\iota , \varrho ]_{\mathbb{T}}\) since
which, together with the concavity of ϖ, yields the relation
Therefore, comparing (34) and (35), we get
On the other hand, since (33) holds, we have that \(\varpi ^{\prime }( \beth ^{\ast }(\rho (\aleph )) \geq \varpi ^{ \prime }( \omega ^{\rho }(\aleph )\Theta ^{\rho }(\aleph ))\), i.e.,
that is,
due to (36).
At last, since \(\Upsilon ^{\nabla }(\aleph )=-\varpi ^{\nabla }( \beth ^{\ast }( \aleph )) +\frac{1}{B}\omega (\aleph )\Theta ^{\nabla }(\aleph ) \varpi ^{\prime }[ \omega ^{\rho }(\aleph )\Theta ^{\rho }(\aleph )] \), relation (37) implies that ϒ is increasing on \([\iota , \varrho ]_{\mathbb{T}}\). Consequently, it follows that
which can be rewritten as
i.e., we obtain (32). The proof is now complete. □
Remark 8
By putting \(\mathbb{T}\mathbbm{=}\mathbb{R}\) and \(\rho (\varkappa )=\varkappa \) in (32), we get (7) of Pečarić et al. [19]. Furthermore, if \(\mathbb{T}\mathbbm{=}\mathbb{N}_{0}\), \(\rho (k)=k-1\), and \(\iota =0\), our Theorem 4 provides the following inequality:
Remark 9
Considering Theorem 4 applied to \(\mathbb{T}=q^{\mathbb{N}_{0}}\) for \(q>1\), we obtain the following discrete inequality:
4 Conclusion and future work
This paper presents several new dynamic inequalities for B-monotone functions in time scales nabla calculus and also several different inequalities in discrete calculus. In the future, we will establish their analogues in diamond alpha calculus.
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Al-Oushoush, N.K., Azar, L.E., Awwad, E. et al. Some new dynamic inequalities for B-monotone functions with respect to time scales nabla calculus. J Inequal Appl 2024, 122 (2024). https://doi.org/10.1186/s13660-024-03202-5
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DOI: https://doi.org/10.1186/s13660-024-03202-5