- Research Article
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Bounds for Certain New Integral Inequalities on Time Scales
Advances in Difference Equations volume 2009, Article number: 484185 (2009)
Abstract
Our aim in this paper is to investigate some new integral inequalities on time scales, which provide explicit bounds on unknown functions. Our results unify and extend some integral inequalities and their corresponding discrete analogues. The inequalities given here can be used as handy tools to study the properties of certain dynamic equations on time scales.
1. Introduction
The study of dynamic equations on time scales, which goes back to its founder Hilger [1], is an area of mathematics that has recently received a lot of attention. For example, we refer the reader to literatures [2–8] and the references cited therein. At the same time, some fundamental integral inequalities used in analysis on time scales have been extended by many authors [9–14]. In this paper, we investigate some new nonlinear integral inequalities on time scales, which unify and extend some continuous inequalities and their corresponding discrete analogues. Our results can be used as handy tools to study the properties of certain dynamic equations on time scales.
Throughout this paper, a knowledge and understanding of time scales and time scale notation is assumed. For an excellent introduction to the calculus on time scales, we refer the reader to monographes [2, 3].
2. Main Results
In what follows, denotes the set of real numbers,
,
denotes the set of integers,
denotes the set of nonnegative integers,
denotes the class of all continuous functions defined on set
with range in the set
,
is an arbitrary time scale,
denotes the set of rd-continuous functions,
denotes the set of all regressive and rd-continuous functions, and
. We use the usual conventions that empty sums and products are taken to be 0 and 1, respectively. Throughout this paper, we always assume that
,
,
, and
are real constants, and
.
We firstly introduce the following lemmas, which are useful in our main results.
Lemma 2.1 ([15] (Bernoulli's inequality)).
Let and
. Then
Lemma 2.2 ([2]).
Let and
be continuous at
, where
with
. Assume that
is rd-continuous on
. If for any
, there exists a neighborhood
of
, independent of
, such that
![](http://media.springernature.com/full/springer-static/image/art%3A10.1155%2F2009%2F484185/MediaObjects/13662_2009_Article_1195_Equ1_HTML.gif)
where denotes the derivative of
with respect to the first variable, then
![](http://media.springernature.com/full/springer-static/image/art%3A10.1155%2F2009%2F484185/MediaObjects/13662_2009_Article_1195_Equ2_HTML.gif)
implies
![](http://media.springernature.com/full/springer-static/image/art%3A10.1155%2F2009%2F484185/MediaObjects/13662_2009_Article_1195_Equ3_HTML.gif)
Lemma 2.3 ([2] (Comparison Theorem)).
Suppose ,
. Then
![](http://media.springernature.com/full/springer-static/image/art%3A10.1155%2F2009%2F484185/MediaObjects/13662_2009_Article_1195_Equ4_HTML.gif)
implies
![](http://media.springernature.com/full/springer-static/image/art%3A10.1155%2F2009%2F484185/MediaObjects/13662_2009_Article_1195_Equ5_HTML.gif)
Lemma 2.4 (see [13]).
Let ,
,
, and
be nonnegative. If
is nondecreasing, then
![](http://media.springernature.com/full/springer-static/image/art%3A10.1155%2F2009%2F484185/MediaObjects/13662_2009_Article_1195_Equ6_HTML.gif)
implies
![](http://media.springernature.com/full/springer-static/image/art%3A10.1155%2F2009%2F484185/MediaObjects/13662_2009_Article_1195_Equ7_HTML.gif)
Next, we establish our main results.
Theorem 2.5.
Assume that ,
,
,
,
and
are nonnegative. Then
![](http://media.springernature.com/full/springer-static/image/art%3A10.1155%2F2009%2F484185/MediaObjects/13662_2009_Article_1195_Equ8_HTML.gif)
implies
![](http://media.springernature.com/full/springer-static/image/art%3A10.1155%2F2009%2F484185/MediaObjects/13662_2009_Article_1195_Equ9_HTML.gif)
where
![](http://media.springernature.com/full/springer-static/image/art%3A10.1155%2F2009%2F484185/MediaObjects/13662_2009_Article_1195_Equ10_HTML.gif)
![](http://media.springernature.com/full/springer-static/image/art%3A10.1155%2F2009%2F484185/MediaObjects/13662_2009_Article_1195_Equ11_HTML.gif)
Proof.
Define a function by
![](http://media.springernature.com/full/springer-static/image/art%3A10.1155%2F2009%2F484185/MediaObjects/13662_2009_Article_1195_Equ12_HTML.gif)
Then (2.8) can be restated as
![](http://media.springernature.com/full/springer-static/image/art%3A10.1155%2F2009%2F484185/MediaObjects/13662_2009_Article_1195_Equ13_HTML.gif)
Using Lemma 2.1, from the above inequality, we easily obtain
![](http://media.springernature.com/full/springer-static/image/art%3A10.1155%2F2009%2F484185/MediaObjects/13662_2009_Article_1195_Equ14_HTML.gif)
![](http://media.springernature.com/full/springer-static/image/art%3A10.1155%2F2009%2F484185/MediaObjects/13662_2009_Article_1195_Equ15_HTML.gif)
It follows from (2.12) and (2.15) that
![](http://media.springernature.com/full/springer-static/image/art%3A10.1155%2F2009%2F484185/MediaObjects/13662_2009_Article_1195_Equ16_HTML.gif)
where and
are defined as in (2.10) and (2.11), respectively. Using Lemma 2.3 and noting
, from (2.16) we have
![](http://media.springernature.com/full/springer-static/image/art%3A10.1155%2F2009%2F484185/MediaObjects/13662_2009_Article_1195_Equ17_HTML.gif)
Therefore, the desired inequality (2.9) follows from (2.14) and (2.17). This completes the proof of Theorem 2.5.
Corollary 2.6.
Assume that ,
, and
are nonnegative. If
is a constant, then
![](http://media.springernature.com/full/springer-static/image/art%3A10.1155%2F2009%2F484185/MediaObjects/13662_2009_Article_1195_Equ18_HTML.gif)
implies
![](http://media.springernature.com/full/springer-static/image/art%3A10.1155%2F2009%2F484185/MediaObjects/13662_2009_Article_1195_Equ19_HTML.gif)
where
![](http://media.springernature.com/full/springer-static/image/art%3A10.1155%2F2009%2F484185/MediaObjects/13662_2009_Article_1195_Equ20_HTML.gif)
Proof.
Letting ,
, and
in Theorem 2.5, we obtain
![](http://media.springernature.com/full/springer-static/image/art%3A10.1155%2F2009%2F484185/MediaObjects/13662_2009_Article_1195_Equ21_HTML.gif)
Therefore,
![](http://media.springernature.com/full/springer-static/image/art%3A10.1155%2F2009%2F484185/MediaObjects/13662_2009_Article_1195_Equ22_HTML.gif)
The proof of Corollary 2.6 is complete.
Remark 2.7.
The result of Theorem 2.5 holds for an arbitrary time scale. Therefore, using Theorem 2.5, we can obtain many results for some peculiar time scales. For example, letting and
, respectively, we have the following two results.
Corollary 2.8.
Let and assume that
, and
. Then the inequality
![](http://media.springernature.com/full/springer-static/image/art%3A10.1155%2F2009%2F484185/MediaObjects/13662_2009_Article_1195_Equ23_HTML.gif)
implies
![](http://media.springernature.com/full/springer-static/image/art%3A10.1155%2F2009%2F484185/MediaObjects/13662_2009_Article_1195_Equ24_HTML.gif)
where and
are defined as in Theorem 2.5.
Corollary 2.9.
Let and assume that
,
,
,
, and
are nonnegative functions defined for
. Then the inequality
![](http://media.springernature.com/full/springer-static/image/art%3A10.1155%2F2009%2F484185/MediaObjects/13662_2009_Article_1195_Equ25_HTML.gif)
implies
![](http://media.springernature.com/full/springer-static/image/art%3A10.1155%2F2009%2F484185/MediaObjects/13662_2009_Article_1195_Equ26_HTML.gif)
where and
are defined as in Theorem 2.5.
Investigating the proof procedure of Theorem 2.5 carefully, we easily obtain the following more general result.
Theorem 2.10.
Assume that ,
,
,
,
, and
are nonnegative,
If there exists a series of positive real numbers
such that
,
then
![](http://media.springernature.com/full/springer-static/image/art%3A10.1155%2F2009%2F484185/MediaObjects/13662_2009_Article_1195_Equ27_HTML.gif)
implies
![](http://media.springernature.com/full/springer-static/image/art%3A10.1155%2F2009%2F484185/MediaObjects/13662_2009_Article_1195_Equ28_HTML.gif)
where
![](http://media.springernature.com/full/springer-static/image/art%3A10.1155%2F2009%2F484185/MediaObjects/13662_2009_Article_1195_Equ29_HTML.gif)
Theorem 2.11.
Assume that ,
,
,
,
,
and
are nonnegative. If
is defined as in Lemma 2.2 such that
and
for
with
, then
![](http://media.springernature.com/full/springer-static/image/art%3A10.1155%2F2009%2F484185/MediaObjects/13662_2009_Article_1195_Equ30_HTML.gif)
implies
![](http://media.springernature.com/full/springer-static/image/art%3A10.1155%2F2009%2F484185/MediaObjects/13662_2009_Article_1195_Equ31_HTML.gif)
where
![](http://media.springernature.com/full/springer-static/image/art%3A10.1155%2F2009%2F484185/MediaObjects/13662_2009_Article_1195_Equ32_HTML.gif)
![](http://media.springernature.com/full/springer-static/image/art%3A10.1155%2F2009%2F484185/MediaObjects/13662_2009_Article_1195_Equ33_HTML.gif)
Proof.
Define a function by
![](http://media.springernature.com/full/springer-static/image/art%3A10.1155%2F2009%2F484185/MediaObjects/13662_2009_Article_1195_Equ34_HTML.gif)
Then . As in the proof of Theorem 2.5, we easily obtain (2.14) and (2.15). Using Lemma 2.2 and combining (2.34) and (2.15), we have
![](http://media.springernature.com/full/springer-static/image/art%3A10.1155%2F2009%2F484185/MediaObjects/13662_2009_Article_1195_Equ35_HTML.gif)
where and
are defined as in (2.32) and (2.33), respectively. Therefore, in the above inequality, using Lemma 2.3 and noting
, we get
![](http://media.springernature.com/full/springer-static/image/art%3A10.1155%2F2009%2F484185/MediaObjects/13662_2009_Article_1195_Equ36_HTML.gif)
It is easy to see that the desired inequality (2.31) follows from (2.14) and (2.36). This completes the proof of Theorem 2.11.
Corollary 2.12.
Let and assume that
,
. If
and its partial derivative
are real–valued nonnegative continuous functions for
with
, then the inequality
![](http://media.springernature.com/full/springer-static/image/art%3A10.1155%2F2009%2F484185/MediaObjects/13662_2009_Article_1195_Equ37_HTML.gif)
implies
![](http://media.springernature.com/full/springer-static/image/art%3A10.1155%2F2009%2F484185/MediaObjects/13662_2009_Article_1195_Equ38_HTML.gif)
where
![](http://media.springernature.com/full/springer-static/image/art%3A10.1155%2F2009%2F484185/MediaObjects/13662_2009_Article_1195_Equ39_HTML.gif)
Corollary 2.13.
Let and assume that
,
,
,
,
and
are nonnegative functions defined for
. If
and
are real-valued nonnegative functions for
with
, then the inequality
![](http://media.springernature.com/full/springer-static/image/art%3A10.1155%2F2009%2F484185/MediaObjects/13662_2009_Article_1195_Equ40_HTML.gif)
implies
![](http://media.springernature.com/full/springer-static/image/art%3A10.1155%2F2009%2F484185/MediaObjects/13662_2009_Article_1195_Equ41_HTML.gif)
where for
with
,
![](http://media.springernature.com/full/springer-static/image/art%3A10.1155%2F2009%2F484185/MediaObjects/13662_2009_Article_1195_Equ42_HTML.gif)
Corollary 2.14.
Suppose that , and
are defined as in Theorem 2.11. If
is nondecreasing for
, then
![](http://media.springernature.com/full/springer-static/image/art%3A10.1155%2F2009%2F484185/MediaObjects/13662_2009_Article_1195_Equ43_HTML.gif)
implies
![](http://media.springernature.com/full/springer-static/image/art%3A10.1155%2F2009%2F484185/MediaObjects/13662_2009_Article_1195_Equ44_HTML.gif)
where
![](http://media.springernature.com/full/springer-static/image/art%3A10.1155%2F2009%2F484185/MediaObjects/13662_2009_Article_1195_Equ45_HTML.gif)
Proof.
Letting ,
,
and
in Theorem 2.11, we obtain
![](http://media.springernature.com/full/springer-static/image/art%3A10.1155%2F2009%2F484185/MediaObjects/13662_2009_Article_1195_Equ46_HTML.gif)
where the inequality holds because is nondecreasing for
. Therefore, using Theorem 2.11 and noting (2.46), we easily have
![](http://media.springernature.com/full/springer-static/image/art%3A10.1155%2F2009%2F484185/MediaObjects/13662_2009_Article_1195_Equ47_HTML.gif)
The proof of Corollary 2.14 is complete.
By Theorem 2.11, we can establish the following more general result.
Theorem 2.15.
Assume that ,
,
,
,
,
, and
are nonnegative,
and there exists a series of positive real numbers
such that
,
. If
is defined as in Lemma 2.2 such that
and
for
with
, then
![](http://media.springernature.com/full/springer-static/image/art%3A10.1155%2F2009%2F484185/MediaObjects/13662_2009_Article_1195_Equ48_HTML.gif)
implies
![](http://media.springernature.com/full/springer-static/image/art%3A10.1155%2F2009%2F484185/MediaObjects/13662_2009_Article_1195_Equ49_HTML.gif)
where
![](http://media.springernature.com/full/springer-static/image/art%3A10.1155%2F2009%2F484185/MediaObjects/13662_2009_Article_1195_Equ50_HTML.gif)
Theorem 2.16.
Let ,
and
be nonnegative,
, and
be nondecreasing. Assume that there exists a series of positive real numbers
such that
,
. If
is a continuous function such that
![](http://media.springernature.com/full/springer-static/image/art%3A10.1155%2F2009%2F484185/MediaObjects/13662_2009_Article_1195_Equ51_HTML.gif)
for and
,
where
is a nonnegative continuous function,
, then
![](http://media.springernature.com/full/springer-static/image/art%3A10.1155%2F2009%2F484185/MediaObjects/13662_2009_Article_1195_Equ52_HTML.gif)
implies
![](http://media.springernature.com/full/springer-static/image/art%3A10.1155%2F2009%2F484185/MediaObjects/13662_2009_Article_1195_Equ53_HTML.gif)
where
![](http://media.springernature.com/full/springer-static/image/art%3A10.1155%2F2009%2F484185/MediaObjects/13662_2009_Article_1195_Equ54_HTML.gif)
![](http://media.springernature.com/full/springer-static/image/art%3A10.1155%2F2009%2F484185/MediaObjects/13662_2009_Article_1195_Equ55_HTML.gif)
![](http://media.springernature.com/full/springer-static/image/art%3A10.1155%2F2009%2F484185/MediaObjects/13662_2009_Article_1195_Equ56_HTML.gif)
Proof.
Let
![](http://media.springernature.com/full/springer-static/image/art%3A10.1155%2F2009%2F484185/MediaObjects/13662_2009_Article_1195_Equ57_HTML.gif)
Then (2.52) can be restated as
![](http://media.springernature.com/full/springer-static/image/art%3A10.1155%2F2009%2F484185/MediaObjects/13662_2009_Article_1195_Equ58_HTML.gif)
It is easy to see that ,
, and
is nondecreasing. Using Lemma 2.4, from (2.58), we have
![](http://media.springernature.com/full/springer-static/image/art%3A10.1155%2F2009%2F484185/MediaObjects/13662_2009_Article_1195_Equ59_HTML.gif)
where is defined as in (2.54). It follows from (2.57) and (2.59) that
![](http://media.springernature.com/full/springer-static/image/art%3A10.1155%2F2009%2F484185/MediaObjects/13662_2009_Article_1195_Equ60_HTML.gif)
Using Lemma 2.1 to the above inequality, we obtain
![](http://media.springernature.com/full/springer-static/image/art%3A10.1155%2F2009%2F484185/MediaObjects/13662_2009_Article_1195_Equ61_HTML.gif)
![](http://media.springernature.com/full/springer-static/image/art%3A10.1155%2F2009%2F484185/MediaObjects/13662_2009_Article_1195_Equ62_HTML.gif)
Noting the hypotheses on , from (2.62), we get
![](http://media.springernature.com/full/springer-static/image/art%3A10.1155%2F2009%2F484185/MediaObjects/13662_2009_Article_1195_Equ63_HTML.gif)
where is defined by (2.55). Clearly,
and
are nondecreasing. Therefore, for any
, from (2.63), we obtain
![](http://media.springernature.com/full/springer-static/image/art%3A10.1155%2F2009%2F484185/MediaObjects/13662_2009_Article_1195_Equ64_HTML.gif)
Let
![](http://media.springernature.com/full/springer-static/image/art%3A10.1155%2F2009%2F484185/MediaObjects/13662_2009_Article_1195_Equ65_HTML.gif)
and define by the right hand of (2.64). Then
,
,
, and
![](http://media.springernature.com/full/springer-static/image/art%3A10.1155%2F2009%2F484185/MediaObjects/13662_2009_Article_1195_Equ66_HTML.gif)
where is defined by (2.56). Using Lemma 2.3 and noting
, from (2.66), we have
![](http://media.springernature.com/full/springer-static/image/art%3A10.1155%2F2009%2F484185/MediaObjects/13662_2009_Article_1195_Equ67_HTML.gif)
Therefore,
![](http://media.springernature.com/full/springer-static/image/art%3A10.1155%2F2009%2F484185/MediaObjects/13662_2009_Article_1195_Equ68_HTML.gif)
It follows from (2.61) and (2.68) that
![](http://media.springernature.com/full/springer-static/image/art%3A10.1155%2F2009%2F484185/MediaObjects/13662_2009_Article_1195_Equ69_HTML.gif)
Letting in (2.69), we immediately obtain the desired inequality (2.53). This completes the proof of Theorem 2.16.
Corollary 2.17.
Let ,
,
, and
be nondecreasing. Assume that there exists a series of positive real numbers
such that
,
. If
is a continuous function such that
![](http://media.springernature.com/full/springer-static/image/art%3A10.1155%2F2009%2F484185/MediaObjects/13662_2009_Article_1195_Equ70_HTML.gif)
for and
,
where
is a continuous function,
, then
![](http://media.springernature.com/full/springer-static/image/art%3A10.1155%2F2009%2F484185/MediaObjects/13662_2009_Article_1195_Equ71_HTML.gif)
implies
![](http://media.springernature.com/full/springer-static/image/art%3A10.1155%2F2009%2F484185/MediaObjects/13662_2009_Article_1195_Equ72_HTML.gif)
where is defined as in (2.56),
![](http://media.springernature.com/full/springer-static/image/art%3A10.1155%2F2009%2F484185/MediaObjects/13662_2009_Article_1195_Equ73_HTML.gif)
Corollary 2.18.
Let ,
,
be nondecreasing,
and
be nonnegative functions defined for
. Assume that there exists a series of positive real numbers
such that
,
. If
such that
![](http://media.springernature.com/full/springer-static/image/art%3A10.1155%2F2009%2F484185/MediaObjects/13662_2009_Article_1195_Equ74_HTML.gif)
for and
,
where
,
, then
![](http://media.springernature.com/full/springer-static/image/art%3A10.1155%2F2009%2F484185/MediaObjects/13662_2009_Article_1195_Equ75_HTML.gif)
implies
![](http://media.springernature.com/full/springer-static/image/art%3A10.1155%2F2009%2F484185/MediaObjects/13662_2009_Article_1195_Equ76_HTML.gif)
where is defined as in (2.56),
![](http://media.springernature.com/full/springer-static/image/art%3A10.1155%2F2009%2F484185/MediaObjects/13662_2009_Article_1195_Equ77_HTML.gif)
Remark 2.19.
Using our main results, we can obtain many dynamic inequalities for some peculiar time scales. Due to limited space, their statements are omitted here.
3. Some Applications
In this section, we present two applications of our main results.
Example 3.1.
Consider the inequality as in (2.25) with ,
,
,
,
,
, and we compute the values of
from (2.25) and also we find the values of
by using the result (2.26). In our computations we use (2.25) and (2.26) as equations and as we see in Table 1 the computation values as in (2.25) are less than the values of the result (2.26).
From Table 1, we easily find that the numerical solution agrees with the analytical solution for some discrete inequalities. The program is written in the programming Matlab 7.0.
Example 3.2.
Consider the following initial value problem on time scales:
![](http://media.springernature.com/full/springer-static/image/art%3A10.1155%2F2009%2F484185/MediaObjects/13662_2009_Article_1195_Equ78_HTML.gif)
where and
are constants, and
is a continuous function.
Assume that
![](http://media.springernature.com/full/springer-static/image/art%3A10.1155%2F2009%2F484185/MediaObjects/13662_2009_Article_1195_Equ79_HTML.gif)
where is defined as in Corollary 2.6,
is a constant. If
is a solution of IVP (3.1), then
![](http://media.springernature.com/full/springer-static/image/art%3A10.1155%2F2009%2F484185/MediaObjects/13662_2009_Article_1195_Equ80_HTML.gif)
where
![](http://media.springernature.com/full/springer-static/image/art%3A10.1155%2F2009%2F484185/MediaObjects/13662_2009_Article_1195_Equ81_HTML.gif)
In fact, the solution of IVP (3.1) satisfies the following equation:
![](http://media.springernature.com/full/springer-static/image/art%3A10.1155%2F2009%2F484185/MediaObjects/13662_2009_Article_1195_Equ82_HTML.gif)
Using the assumption (3.2), from (3.5), we have
![](http://media.springernature.com/full/springer-static/image/art%3A10.1155%2F2009%2F484185/MediaObjects/13662_2009_Article_1195_Equ83_HTML.gif)
Now a suitable application of Corollary 2.6 to (3.6) yields (3.2).
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Acknowledgments
This work is supported by the Natural Science Foundation of Shandong Province (Y2007A08), the National Natural Science Foundation of China (60674026, 10671127), China Postdoctoral Science Foundation Funded Project (20080440633), Shanghai Postdoctoral Scientific Program (09R21415200), the Project of Science and Technology of the Education Department of Shandong Province (J08LI52), and the Doctoral Foundation of Binzhou University (2006Y01).
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Li, W.N. Bounds for Certain New Integral Inequalities on Time Scales. Adv Differ Equ 2009, 484185 (2009). https://doi.org/10.1155/2009/484185
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DOI: https://doi.org/10.1155/2009/484185