PROBLEMS
M. Chrobak, M. Habib, P. John, H. Sachs, H. Zernitz, J. R. Reay, G. Sierksma, M. M. Sysło, T. Traczyk, W. Wessel (1987)
Applicationes Mathematicae
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Displaying similar documents to “Powerful amicable numbers”
PROBLEMS
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One Erdös style inequality
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Heinz Neudecker (2004)
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The main aim is to estimate the noncentrality matrix of a noncentral Wishart distribution. The method used is Leung's but generalized to a matrix loss function. Parallelly Leung's scalar noncentral Wishart identity is generalized to become a matrix identity. The concept of Löwner partial ordering of symmetric matrices is used.
A Z-set unknotting theorem for Nöbeling spaces
Michael Levin (2009)
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We prove a Z-set unknotting theorem for Nöbeling spaces.
On elementary symmetric functions of the eigenvalues of the sum and product of normal matrices
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A note on Professor Jan Grzegorz Krzyż
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Trajectories and natural numbers
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A matrix derivation of a representation theorem for (tr A).
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A matrix derivation of a well-known representation theorem for (tr A) is given, which is the solution of a restricted maximization problem. The paper further gives a solution of the corresponding restricted minimization problem.
A note on the scalar Haffian.
Heinz Neudecker (2000)
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In this note a uniform transparent presentation of the scalar Haffian will be given. Some well-known results will be generalized. A link will be established between the scalar Haffian and the derivative matrix as developed by Magnus and Neudecker.
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