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math.RA2026
Graphs of Moore-Penrose inverse of matrices possessing the treeangle property
A. M. Encinas, K. Kranthi Priya, K. C. Sivakumar
It is known that the inverse of an invertible real square matrix satisfying the treeangle property, is a treediagonal matrix. A converse statement also holds. We show that the verb…
math.RA2018
Explicit inverse of nonsingular Jacobi matrices
A. M. Encinas, M. J. Jiménez
We present here the necessary and sufficient conditions for the invertibility of tridiagonal matrices, commonly named Jacobi matrices, and explicitly compute their inverse. The tec…