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math.RA1998
Hermitian Positive Semidefinite Matrices Whose Entries Are 0 Or 1 in Modulus
Daniel Hershkowitz, Michael Neumann, Hans Schneider
We show that a matrix is a Hermitian positive semidefinite matrix whose nonzero entries have modulus 1 if and only if it similar to a direct sum of all matrices and a 0 matri…
math.RA1998
Bounds on norms of compound matrices and on products of eigenvalues
Ludwig Elsner, Daniel Hershkowitz, Hans Schneider
An upper bound on operator norms of compound matrices is presented, and special cases that involve the , and norms are investigated. The results are…