Showing math.RAShow all
2 papers · 1 filter
math.RA2026
Inverse acyclic Z-matrices, matrices of tree structure and shifted generalized ultrametric matrices
Reinhard Nabben
Inverses of acyclic or treediagonal matrices are nicely characterized in the landmarked paper by Klein \cite{KLe82}. But also in \cite{Nab01} a characterization of these inverses i…
math.RA2026
Hidden decay in the inverses of acyclic matrices
Reinhard Nabben
It is well-known that the absolute values of the entries of the inverse of a diagonally dominant tridiagonal matrix decay away from the diagonal. Moreover, lower and upper bounds f…