Displaying similar documents to “Matrix transformation method of approximate solution of partial differential equations”

The problem of kings.

Larsen, Michael (1995)

The Electronic Journal of Combinatorics [electronic only]


Sufficient conditions to be exceptional

Charles R. Johnson, Robert B. Reams (2016)

Special Matrices


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).