Abstract
The {R,s+1,k}- and {R,s+1,k,∗}-potent matrices have been studied in several recent papers. We continue these investigations from a spectral point of view. Specifically, a spectral study of {R,s+1,k}-potent matrices is developed using characterizations involving an associated matrix pencil (A,R). The corresponding spectral study for {R,s+1,k,∗}-potent matrices involves the pencil (A∗,R). In order to present some properties, the relevance of the projector I−AA# where A# is the group inverse of A is highlighted. In addition, some applications and numerical examples are given, particularly involving Pauli matrices and the quaternions.
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