Research Article | Open Access

Volume 2014 |Article ID 949860 | https://doi.org/10.1155/2014/949860

Deepak B. Pachpatte, "On Inequality Applicable to Partial Dynamic Equations", International Journal of Differential Equations, vol. 2014, Article ID 949860, 4 pages, 2014. https://doi.org/10.1155/2014/949860

# On Inequality Applicable to Partial Dynamic Equations

Accepted26 Mar 2014
Published15 Apr 2014

#### Abstract

The main objective of the paper is to study new integral inequality on time scales which is used for the study of some partial dynamic equations. Some applications of our results are also given.

#### 1. Introduction

During past few decades many authors have established various dynamic inequalities useful in the development of differential and integral equations. Mathematical inequalities on time scales play an important role in the theory of dynamic equations. The study of time scale was initiated by Hilger  in 1990 in his Ph.D. thesis which unifies continuous and discrete calculus. Since then, many authors have studied various properties of dynamic equations on time scales .

In what follows, let denotes the set of real numbers and let denote the arbitrary time scales. Let , , and be subsets of and . Let denote the set of rd-continuous function. The partial delta derivative of for with respect to , , and is denoted by , , and . We assume here understanding of time scales calculus and notations. Further information about time scales calculus can be found in [1, 5, 10].

We require the following lemmas given in [5, 6].

Lemma 1 (see , Theorem 2.6). Let , , and for all ; then for all .

Lemma 2 (see , Lemma 2.1). Let and is nondecreasing in and for ; then where for .

#### 2. Main Results

Now in this section we give our main results.

Theorem 3. Let , , , , and suppose that for , where is a constant. If where for , then for .

Proof. Define a function by Then (6) is It is easy to see that is nonnegative, rd-continuous, and nondecreasing function for . Treating fixed and using Lemma 1 we get for , where is defined by (9). From (11), (12), and the fact that , we have Define a function by right hand side of (14). Then , . One has Define a function by then , , By keeping fixed in (18), taking and delta integrating with second variable from to . Using the fact that and is nondecreasing in , we have Let then (20) gives Now treating fixed in (21) and applying Lemma 1, we have From (18), (22), and (7), it is easy to see that Using (23) in (22) and the fact that and we get the inequality in (10).
This completes the proof.

#### 3. Applications

Now we give some application of theorem to study properties of solutions of initial value problem: where , for , , , , is delta differentiable with respect to .

We observe that (24) is equivalent to where The following theorem deals with estimate on solution (24).

Theorem 4. Suppose where , , which are as in Theorem 3 and is rd-continuous function defined on such that . Let where for . If is any solution of (24), then where .

Proof. The solution of (24) satisfies (25). Using (27) in (25) we have Now an application of Theorem 3 (with ) to (32) yields (30).
This completes the proof.

Now we establish the uniqueness of solutions of (24).

Theorem 5. Suppose that where , , and are as in Theorem 4. Let and be as in (28) and (30). Then (24) has at most one solution on .

Proof. Let and be two solutions of (24) on ; then we have From (34) and (33) we obtain Applying Theorem 3 (with , ) yields Therefore ; there is at most one solution of (24) in .

#### Conflict of Interests

The author declares that there is no conflict of interests regarding the publication of this paper.

1. S. Hilger, “Analysis on measure chains—a unified approach to continuous and discrete calculus,” Results in Mathematics, vol. 18, no. 1-2, pp. 18–56, 1990.
2. S. András and A. Mészáros, “Wendroff type inequalities on time scales via Picard operators,” Mathematical Inequalities & Applications, vol. 16, no. 1, pp. 159–174, 2013.
3. D. R. Anderson, “Dynamic double integral inequalities in two independent variables on time scales,” Journal of Mathematical Inequalities, vol. 2, no. 2, pp. 163–184, 2008.
4. D. R. Anderson, “Nonlinear dynamic integral inequalities in two independent variables on time scale pairs,” Advances in Dynamical Systems and Applications, vol. 3, no. 1, pp. 1–13, 2008. View at: Google Scholar | MathSciNet
5. E. Akin-Bohner, M. Bohner, and F. Akin, “Pachpatte inequalities on time scales,” Journal of Inequalities in Pure and Applied Mathematics, vol. 6, no. 1, article 6, 2005.
6. R. A. C. Ferreira and D. F. M. Torres, “Some linear and nonlinear integral inequalities on time scales in two independent variables,” Nonlinear Dynamics and Systems Theory, vol. 9, no. 2, pp. 161–169, 2009.
7. D. B. Pachpatte, “Explicit estimates on integral inequalities with time scale,” Journal of Inequalities in Pure and Applied Mathematics, vol. 7, no. 4, article 143, 2006.
8. D. B. Pachpatte, “Properties of solutions to nonlinear dynamic integral equations on time scales,” Electronic Journal of Differential Equations, vol. 2008, no. 136, pp. 1–8, 2008.
9. D. B. Pachpatte, “Integral inequalitys for partial dynamic equations on time scales,” Electronic Journal of Differential Equations, vol. 2012, no. 50, pp. 1–7, 2012.
10. M. Bohner and A. Peterson, Dynamic Equations on Time Scales, Birkhäuser, Boston, Mass, USA, 2001. View at: Publisher Site | MathSciNet

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