In this paper, we establish some generalization of weighted Ostrowski type integral inequalities for functions of bounded variation.
Let be a differentiable mapping on
whose derivative
is bounded on
i.e.
Then we have the inequality
![]() | (1) |
for all 16. The constant
is the best possible. This inequality is well known in the literature as the Ostrowski inequality.
Definition 1. Let be any partition of
and let
Then
is said to be of bounded variation if the sum
![]() |
is bounded for all such partitions.
Let be of bounded variation on
, and
denotes the sum
corresponding to the partition
of
. The number
![]() |
is called the total variation of on
Here
denotes the family of partitions of
In 7, Dragomir proved following Ostrowski type inequalities related functions of bounded variation:
Theorem 1. Let be a mapping of bounded variation on
Then
![]() |
holds for all The constant
is the best possible.
In 9, Dragomir gave a simple proof of following Lemma:
Lemma 1. Let If
is continious on
and
is bounded variation on
then
![]() |
In 5, Dragomir obtained following Ostrowski type inequality for functions of bounded variation:
Theorem 2. Let
be a division of the interval
and
be
points so that
If
is of bounded variation on
then we have the inequality:
![]() | (2) |
where
and
is the total variation of
on the interval
For some recent results connected with functions of bounded variation see 1, 2, 3, 4, 6, 8, 10, 11, 12, 13, 14, 15, 17, 18, 19, 20, 21.
The aim of this paper is to obtain some generalization of weighted Ostrowski type integral inequalities for functions of bounded variation.
Firstly, we will give the following notations which are used in main Theorem:
Let
be a partition of the interval
,
be
points so that
Let
be continious and positive mapping on
, and
![]() |
![]() |
Theorem 3. If is of bounded variation on
then we have the inequalities
![]() | (3) |
and
![]() | (4) |
where is the total variation of
on the interval
Proof. Let us consider the functions defined by
![]() |
Integrating by parts , we obtain
![]() | (5) |
In last equality in (5), we have
![]() | (6) |
and similarly
![]() | (7) |
Adding (6) and (7) in (5), we get the equality
![]() | (8) |
On the other hand, taking modulus in (8) and using triangle inequality we have
![]() | (9) |
Using Lemma 1 in last inequality in (9), we have
![]() | (10) |
Putting (10) in (9), we obtain
![]() | (11) |
![]() |
This completes the proof of first inequality in (3).
On the other hand, in last inequality in (11), we have
![]() | (12) |
Adding (12) in last inequality in (11), we obtain the inequality (3).
Finally, for proof of inequality (4), taking modulus in (8), we have
![]() | (13) |
Using Lemma 1 for the last integral of (13), we have
![]() | (14) |
Adding (14) in (13), we obtain
![]() | (15) |
![]() |
which completes the proof of first inequality in (4).
Using triangle inequality in last inequality in (15), we have
![]() |
and
![]() |
This completes the proof.
Remark 1. Under assumptions Theorem 3 with , the inequality (3) reduces inequality (2).
Remark 2. If (differantiable with respect to
) in Theorem 3, then we have the inequality
![]() | (16) |
which was proved by Kuei-Lin Tseng et al. in 20.
Remark 3. If we choose
in (16), inequality reduces inequality (2).
Corollary 1. Under assumption Theorem 3, choosing
in inequality (4) we obtain the inequality
![]() | (17) |
Remark 4.
1) In (17), if we take then we have the "weighted left rectangle inequality"
![]() |
2) If we take in (17) then we have the "weighted right rectangle inequality"
![]() |
Let us consider the arbitrary division
![]() |
and let be continious function with
![]() |
Then the following Theorem holds.
Theorem 4. Let is of bounded variatin on
and
Then we have the quadrature formula:
![]() |
The remainder term satisfies
![]() | (18) |
Proof. Applying Corollary 1 to interval we have the inequality
![]() | (19) |
Summing the inequality (19) over from
to
, then we have
![]() |
This completes proof of the first inequality in (18).
Also, we have
![]() |
and
![]() |
which completes the proof.
Remark 5.
1) If we choose then we have the weighted left rectangle rule
![]() |
The remainder satisfies
![]() |
2) Similarly, choosing we have the weighted right rectangle rule
![]() |
And, the remainder term satisfies
![]() |
[1] | Alomari, M. W., “A Generalization of weighted companion of Ostrowski integral inequality for mappings of bounded variation,” RGMIA Research Report Collection, 14, 2011, Article 87, 11 pp. | ||
In article | View Article | ||
[2] | Alomari, M. W. and Latif, M.A. “Weighted companion for the Ostrowski and the generalized trapezoid inequalities for mappings of bounded variation,” RGMIA Research Report Collection, 14, 2011, Article 92, 10 pp. | ||
In article | View Article | ||
[3] | Cerone, P. Cheung, W.S. and Dragomir, S.S., “On Ostrowski type inequalities for Stieltjes integrals with absolutely continuous integrands and integrators of bounded variation,” Computers and Mathematics with Applications, 54, 2007, 183-191. | ||
In article | View Article | ||
[4] | P. Cerone, S. S. Dragomir, and C. E. M. Pearce, A generalized trapezoid inequality for functions of bounded variation, Turk J Math, 24 (2000), 147-163. | ||
In article | View Article | ||
[5] | Dragomir, S. S., “The Ostrowski integral inequality for mappings of bounded variation,” Bull.Austral. Math. Soc., 60(1), 1999, 495-508. | ||
In article | View Article | ||
[6] | Dragomir, S. S., “On the midpoint quadrature formula for mappings with bounded variation and applications,” Kragujevac J. Math. 22, 2000, 13-19. | ||
In article | View Article | ||
[7] | Dragomir, S. S., “On the Ostrowski's integral inequality for mappings with bounded variation and applications,” Math. Inequal. Appl. 4(1), 2001, 59-66. | ||
In article | View Article | ||
[8] | Dragomir, S. S., “A companion of Ostrowski's inequality for functions of bounded variation and applications,” Int. J. Nonlinear Anal. Appl. 5(1), 2014, 89-97. | ||
In article | View Article | ||
[9] | Dragomir, S. S., “Refinements of the generalised trapezoid and Ostrowski inequalities for functions of bounded variation.” Arch. Math. (Basel) 91(5), 2008, 450-460. | ||
In article | View Article | ||
[10] | Dragomir, S.S. and Momoniat, E., “A Three point quadrature rule for functions of bounded variation and applications,” RGMIA Research Report Collection, 14, 2011, Article 33, 16 pp. | ||
In article | View Article | ||
[11] | Dragomir, S. S., “Some perturbed Ostrowski type inequalities for functions of bounded variation,” RGMIA Res. Rep. Coll. 16, 2013, Art. 93. | ||
In article | View Article | ||
[12] | Liu, W. and Sun, Y., “A Refinement of the companion of Ostrowski inequality for functions of bounded variation and Applications,” arXiv:1207.3861v1, 2012. | ||
In article | View Article | ||
[13] | Mishra, V.N., “Some problems on approximations of functions in banach spaces,” Ph.D. Thesis (2007), Indian Institute of Technology, Roorkee 247 667, Uttarakhand, India. | ||
In article | |||
[14] | Mishra V.N. and Mishra, L.N., “Trigonometric approximation of signals (Functions) in LP (p≥1)-norm,” International Journal of Contemporary Mathematical Sciences, 7(19), 2012, 909-918. | ||
In article | View Article | ||
[15] | Mishra, L.N., “On existence and behavior of solutions to some nonlinear integral equations with Applications,” Ph.D. Thesis (2017), National Institute of Technology, Silchar 788010, Assam, India. | ||
In article | |||
[16] | Ostrowski, A., M. “Über die absolutabweichung einer differentiebaren funktion von ihrem integralmitelwert,” Comment. Math. Helv. 10, 1938, 226-227. | ||
In article | View Article | ||
[17] | Tseng, K-L, Yang, G-S and Dragomir, S. S., “Generalizations of weighted trapezoidal inequality for mappings of bounded variation and their applications,” Mathematical and Computer Modelling, 40, 2004, 77-84. | ||
In article | View Article | ||
[18] | Tseng, K-L, “Improvements of some inequalites of Ostrowski type and their applications,” Taiwan. J. Math. 12(9), 2008, 2427-2441. | ||
In article | View Article | ||
[19] | Tseng, K-L, Hwang, S-R, Yang, G-S and Chou, Y-M, “Improvements of the Ostrowski integral inequality for mappings of bounded variation I,” Applied Mathematics and Computation 217, 2010, 2348-2355. | ||
In article | View Article | ||
[20] | Tseng, K-L, Hwang, S-R, Yang, G-S and Chou, Y-M, “Weighted Ostrowski ,ntegral ,nequality for mappings of bounded variation,“ Taiwanese J. of Math., 15(2), 2011, 573-585. | ||
In article | View Article | ||
[21] | Tseng, K-L, “Improvements of the Ostrowski integral inequality for mappings of bounded variation II,” Applied Mathematics and Computation 218, 2012, 5841-5847. | ||
In article | View Article | ||
Published with license by Science and Education Publishing, Copyright © 2017 Hüseyin Budak and Mehmet Zeki Sarıkaya
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[1] | Alomari, M. W., “A Generalization of weighted companion of Ostrowski integral inequality for mappings of bounded variation,” RGMIA Research Report Collection, 14, 2011, Article 87, 11 pp. | ||
In article | View Article | ||
[2] | Alomari, M. W. and Latif, M.A. “Weighted companion for the Ostrowski and the generalized trapezoid inequalities for mappings of bounded variation,” RGMIA Research Report Collection, 14, 2011, Article 92, 10 pp. | ||
In article | View Article | ||
[3] | Cerone, P. Cheung, W.S. and Dragomir, S.S., “On Ostrowski type inequalities for Stieltjes integrals with absolutely continuous integrands and integrators of bounded variation,” Computers and Mathematics with Applications, 54, 2007, 183-191. | ||
In article | View Article | ||
[4] | P. Cerone, S. S. Dragomir, and C. E. M. Pearce, A generalized trapezoid inequality for functions of bounded variation, Turk J Math, 24 (2000), 147-163. | ||
In article | View Article | ||
[5] | Dragomir, S. S., “The Ostrowski integral inequality for mappings of bounded variation,” Bull.Austral. Math. Soc., 60(1), 1999, 495-508. | ||
In article | View Article | ||
[6] | Dragomir, S. S., “On the midpoint quadrature formula for mappings with bounded variation and applications,” Kragujevac J. Math. 22, 2000, 13-19. | ||
In article | View Article | ||
[7] | Dragomir, S. S., “On the Ostrowski's integral inequality for mappings with bounded variation and applications,” Math. Inequal. Appl. 4(1), 2001, 59-66. | ||
In article | View Article | ||
[8] | Dragomir, S. S., “A companion of Ostrowski's inequality for functions of bounded variation and applications,” Int. J. Nonlinear Anal. Appl. 5(1), 2014, 89-97. | ||
In article | View Article | ||
[9] | Dragomir, S. S., “Refinements of the generalised trapezoid and Ostrowski inequalities for functions of bounded variation.” Arch. Math. (Basel) 91(5), 2008, 450-460. | ||
In article | View Article | ||
[10] | Dragomir, S.S. and Momoniat, E., “A Three point quadrature rule for functions of bounded variation and applications,” RGMIA Research Report Collection, 14, 2011, Article 33, 16 pp. | ||
In article | View Article | ||
[11] | Dragomir, S. S., “Some perturbed Ostrowski type inequalities for functions of bounded variation,” RGMIA Res. Rep. Coll. 16, 2013, Art. 93. | ||
In article | View Article | ||
[12] | Liu, W. and Sun, Y., “A Refinement of the companion of Ostrowski inequality for functions of bounded variation and Applications,” arXiv:1207.3861v1, 2012. | ||
In article | View Article | ||
[13] | Mishra, V.N., “Some problems on approximations of functions in banach spaces,” Ph.D. Thesis (2007), Indian Institute of Technology, Roorkee 247 667, Uttarakhand, India. | ||
In article | |||
[14] | Mishra V.N. and Mishra, L.N., “Trigonometric approximation of signals (Functions) in LP (p≥1)-norm,” International Journal of Contemporary Mathematical Sciences, 7(19), 2012, 909-918. | ||
In article | View Article | ||
[15] | Mishra, L.N., “On existence and behavior of solutions to some nonlinear integral equations with Applications,” Ph.D. Thesis (2017), National Institute of Technology, Silchar 788010, Assam, India. | ||
In article | |||
[16] | Ostrowski, A., M. “Über die absolutabweichung einer differentiebaren funktion von ihrem integralmitelwert,” Comment. Math. Helv. 10, 1938, 226-227. | ||
In article | View Article | ||
[17] | Tseng, K-L, Yang, G-S and Dragomir, S. S., “Generalizations of weighted trapezoidal inequality for mappings of bounded variation and their applications,” Mathematical and Computer Modelling, 40, 2004, 77-84. | ||
In article | View Article | ||
[18] | Tseng, K-L, “Improvements of some inequalites of Ostrowski type and their applications,” Taiwan. J. Math. 12(9), 2008, 2427-2441. | ||
In article | View Article | ||
[19] | Tseng, K-L, Hwang, S-R, Yang, G-S and Chou, Y-M, “Improvements of the Ostrowski integral inequality for mappings of bounded variation I,” Applied Mathematics and Computation 217, 2010, 2348-2355. | ||
In article | View Article | ||
[20] | Tseng, K-L, Hwang, S-R, Yang, G-S and Chou, Y-M, “Weighted Ostrowski ,ntegral ,nequality for mappings of bounded variation,“ Taiwanese J. of Math., 15(2), 2011, 573-585. | ||
In article | View Article | ||
[21] | Tseng, K-L, “Improvements of the Ostrowski integral inequality for mappings of bounded variation II,” Applied Mathematics and Computation 218, 2012, 5841-5847. | ||
In article | View Article | ||