Research articles
ScienceAsia 44 (2018): 54-65 |doi:
10.2306/scienceasia1513-1874.2018.44.054
A companion of Ostrowski's inequality for complex functions defined on the unit circle and applications
Gang�Li, Yue�Luan, Jiangyong�Yu*
ABSTRACT: Some companions of Ostrowski's inequality for complex functions defined on the unit circle are proved. Our results in special cases not only recapture known results, but also give a smaller estimator than that of the known results. Applications to a composite quadrature rule and to functions of unitary operators in Hilbert spaces are also considered.
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| College�of�Mathematics�and�Statistics, Nanjing�University�of�Information�Science�and�Technology, Nanjing�210044, China |
* Corresponding author, E-mail: yjyamxp@outlook.com
Received 3 Jul 2017, Accepted 15 Oct 2017
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