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On properties of lower \(k\)-Hessenberg Toeplitz matrices. (English) Zbl 1373.15046

The \(LU\) factorization of a \(k\)-lower Hessenberg Toeplitz matrix \(H_{n}^{(k)} (a,b,c)= [h_{i,j}]_{1\leq i,j \leq n}\) with entries \(h_{i,i}=a\), \(h_{i,i+1}=b\), \(h_{i+k,i}=c\) and zero otherwise is deduced. Indeed, the explicit expression of the matrices \(L\) and \(U\) is obtained as well as their inverses. As a direct consequence, the authors obtain the inverse of \(H_{n}^{(k)} (a,b,c)\).

MSC:

15B05 Toeplitz, Cauchy, and related matrices
15A23 Factorization of matrices
15A09 Theory of matrix inversion and generalized inverses