2026/06/28 by Reinhard Nabben
Mathematics · #math.RA #msc:15A48 #msc:15A57 #msc:65F10
19 pages
arxiv created 2026/06/28 · arxiv updated 2026/07/31
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 for these absolute values are known for a long time. The graph of a tridiagonal matrix can be viewed as a line. Thus tridiagonal matrices are special acyclic matrices, i.e. matrices whose graph is a tree. In this paper we explore the structure of inverses of acyclic matrices. However, there is no strict decay from the diagonal in the inverses of diagonally dominant acyclic matrices. The decay is somehow hidden. Here we identify this decay which can be described nicely. Moreover we give bounds for the absolute value of the entries of the inverses of acyclic matrices. All of our results generalize results for tridiagonal matrices.