Generalized Green's functions for higher order boundary value matrix differential systems.
Villanueva, R.J., Jodar, L. (1992)
International Journal of Mathematics and Mathematical Sciences
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Villanueva, R.J., Jodar, L. (1992)
International Journal of Mathematics and Mathematical Sciences
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Al'pin, Yu.A., Ilyin, S.N. (2005)
Zapiski Nauchnykh Seminarov POMI
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Branislav Martić (1984)
Publications de l'Institut Mathématique
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Mazanik, S.A. (1998)
Memoirs on Differential Equations and Mathematical Physics
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Larsen, Michael (1995)
The Electronic Journal of Combinatorics [electronic only]
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M. Haverić (1984)
Matematički Vesnik
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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).
Rufus Oldenburger (1940)
Compositio Mathematica
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Janaki, T.M., Rangarajan, Govindan (2003)
International Journal of Mathematics and Mathematical Sciences
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