tailieunhanh - Báo cáo: Bessel and Gruss Type Inequalities in Inner Product Modules over Banach ∗-Algebras

Hindawi Publishing Corporation Journal of Inequalities and Applications Volume 2011, Article ID 562923, 16 pages doi: Research Article ¨ Bessel and Gruss Type Inequalities in Inner Product Modules over Banach ∗-Algebras A. G. Ghazanfari1 and S. S. Dragomir2, 3 1 2 Department of Mathematics, Lorestan University, . Box 465, Khoramabad, Iran School of Engineering and Science, Victoria University, . Box 14428, Melbourne City, MC 8001, Australia 3 School of Computational and Applied Mathematics, University of the Witwatersrand, Private Bag 3 Wits 2050, Johannesburg, South Africa Correspondence should be addressed to A. G. Ghazanfari, Received 11 January 2011; Accepted 1 March 2011 Academic Editor:. | Hindawi Publishing Corporation Journal of Inequalities and Applications Volume 2011 Article ID 562923 16 pages doi 2011 562923 Research Article Bessel and Gruss Type Inequalities in Inner Product Modules over Banach -Algebras A. G. Ghazanfari1 and S. S. Dragomir2 3 1 Department of Mathematics Lorestan University . Box 465 Khoramabad Iran 2 School of Engineering and Science Victoria University . Box 14428 Melbourne City MC 8001 Australia 3 School of Computational and Applied Mathematics University of the Witwatersrand Private Bag 3 Wits 2050 Johannesburg South Africa Correspondence should be addressed to A. G. Ghazanfari Received 11 January 2011 Accepted 1 March 2011 Academic Editor Paolo E. Ricci Copyright 2011 A. G. Ghazanfari and S. S. Dragomir. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. We give an analogue of the Bessel inequality and we state a simple formulation of the Gruss type inequality in inner product c -modules which is a refinement of it. We obtain some further generalization of the Gruss type inequalities in inner product modules over proper H -algebras and unital Banach -algebras for c -seminorms and positive linear functionals. 1. Introduction A proper H -algebra is a complex Banach -algebra A II II where the underlying Banach space is a Hilbert space with respect to the inner product satisfying the properties ab c b a c and ba c b ca for all a b c e A. A c -algebra is a complex Banach -algebra A II II such that a a a 2 for every a e A. If A is a proper H -algebra or a c -algebra and a eA is such that A a 0 or aA 0 then a 0. For a proper H -algebra A the trace class associated with A is T A ab a b e A . For every positive a e T A there exists the square root of a that is a unique positive a1 2 e A such that a1 2 2 a the square root of a a is .

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