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math.SP2024
A simplification of the C-realizability criterion for the Nonnegative Inverse Eigenvalue Problem for integers
Alberto Borobia, Roberto Canogar
A multiset of complex numbers is said to be realizable whenever there exists a nonnegative matrix of order with spectrum . One of the broadest criteri…
math.SP2020
Companion unit lower Hessenberg matrices
Alberto Borobia, Roberto Canogar
In recent years there has been a growing interest in companion matrices. There is a deep knowledge of sparse companion matrices, in particular it is known that every sparse compani…