6,415 research outputs found
Characterizing and approximating eigenvalue sets of symmetric interval matrices
We consider the eigenvalue problem for the case where the input matrix is
symmetric and its entries perturb in some given intervals. We present a
characterization of some of the exact boundary points, which allows us to
introduce an inner approximation algorithm, that in many case estimates exact
bounds. To our knowledge, this is the first algorithm that is able to guaran-
tee exactness. We illustrate our approach by several examples and numerical
experiments
On two inequalities of \v{C}eby\v{s}ev
In this work, several sharp bounds for the \v{C}eby\v{s}ev functional
involving various type of functions are proved. In particular, for the
\v{C}eby\v{s}ev functional of two absolutely continuous functions whose first
derivatives are both convex, convex and belong to -spaces, convex and
bounded variation, convex and Lipschitz mappings new sharp bounds are
presented. Other related results regarding two convex and concave functions are
given.Comment: 11 page
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