On the generalizations of two Ozeki's results
J. E. Pečarić (1982)
Matematički Vesnik
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Displaying similar documents to “Transformations which preserve convexity.”
On the generalizations of two Ozeki's results
Convexity preserving summability matrices.
Selvaraj, C.R. (1990)
International Journal of Mathematics and Mathematical Sciences
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A theorem on polygons in n dimensions with applications to variation-diminishing and cyclic variation-diminishing linear transformations
I. J. Schoenberg, Anne Whitney (1951)
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Differential analysis of matrix convex functions. II.
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Linear transformations from a function space
Steib, Michael L. (1973)
Portugaliae mathematica
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Stabilization of nonlinear systems by similarity transformations.
Zuber, Irina E. (1998)
Journal of Applied Mathematics and Stochastic Analysis
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On the convexity of high order of sequences.
Toader, G. (1988)
Publications de l'Institut Mathématique. Nouvelle Série
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Sufficient conditions to be exceptional
Charles R. Johnson, Robert B. Reams (2016)
Special Matrices
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A copositive matrix A is said to be exceptional if it is not the sum of a positive semidefinite matrix and a nonnegative matrix. We show that with certain assumptions on A−1, especially on the diagonal entries, we can guarantee that a copositive matrix A is exceptional. We also show that the only 5-by-5 exceptional matrix with a hollow nonnegative inverse is the Horn matrix (up to positive diagonal congruence and permutation similarity).
On continuous convex or concave functions with respect to the logarithmic mean
T. Zgraja (2005)
Acta Universitatis Carolinae. Mathematica et Physica
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