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In this paper, we utilize some known Steffensen-type identities, obtained by using Lidstone’s interpolating polynomial, to prove new generalizations of Steffensen’s inequality. We obtain these new generalizations by using the weighted Hermite-Hadamard inequality for...
We study the problem: whether a given operator on a Banach space has an invariant affine subspace. We examine the existence or non-existence of such affine subspaces. Moreover, we give some applications.
In the paper, we will present some important results from the theory of vector-valued invariant means. Discussing the results contained in the author’s paper Badora (Ann Pol Math 58:147–159, 1993), we will add new facts that were previously not published.
Gähler (Untersuchungen über verallgemeinerte m-metrische Räume. I”. German. Math Nachr 40, 165–189, 1969) investigated m-metric spaces and in particular m-normed spaces over the field of reals. Here the existence of m-norms will be investigated and this in the more general setting of vector...
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