
Let \(T\) be the unit circle and \(a(t)=|1-\tau|^{2p}f(\tau), \tau\in T\), where \(p\in\mathbb{N}\) and \(f\) is a positive continuous function such that \(\sum_{n\in \mathbb{Z}} |n||f_n|<\infty\), and \(f_n\) are the Fourier coefficients. \textit{P. Rambour} and \textit{A. Seghier} [C. R. Acad. Sci., Paris 335, No. 8, 705--710 (2002; Zbl 1012.65025); erratum: ibid. 336, 399--400 (2003); Integral Equations Oper. Theory 50, No. 1, 83--114 (2004; Zbl 1069.47027)] discussed the asymptotic behavior of the \(j,k\) entry \([T_n^{-1} (a)]_{j,k}\) as \(n\to\infty\) of the Toeplitz \((n+1)\times (n+1)\) matrix \(T_n^{-1} (a)=(T_n (a))^{-1},\;T_n (a)=(a_{j-k})_{j,k=0}^n\). They established that \[ [T_n^{-1} (a)]_{[nx],[ny]}= \frac{1}{f(1)}G_p(x,y)n^{2p-1}+o(n^{2p-1}), \] as \(n\to\infty\) uniformly with respect to \(x\) and \(y\) in \([0,1]\). They also remarked that \(G_1(x,y)=x(1-y), G_2(x,y)=\frac 16 x^2(1-y)^2 (3y-x-2xy).\) In the present paper, the author gives an elegant method for the calculation of \(G_p(x,y)\) for any \(p\in \mathbb{N}\). Theorem. For \(0\leq x\leq 1\) and \(y\geq \max (x,1-x)\), \[ G_p(x,y)=\frac{x^py^p}{[(p-1)!]^2}\int_y^1\frac{(t-x)^{p-1}(t-y)^{p-1}}{t^{2p}}dt. \] The asymptotic behavior of the trace and sum of all entries are also considered.
Applications of operator theory to differential and integral equations, Green's functions for ordinary differential equations, Toeplitz operators, Hankel operators, Wiener-Hopf operators, Applications of operator theory in probability theory and statistics, Theory of matrix inversion and generalized inverses, Toeplitz matrix, inverse matrix, Green's function, singular symbol
Applications of operator theory to differential and integral equations, Green's functions for ordinary differential equations, Toeplitz operators, Hankel operators, Wiener-Hopf operators, Applications of operator theory in probability theory and statistics, Theory of matrix inversion and generalized inverses, Toeplitz matrix, inverse matrix, Green's function, singular symbol
| selected citations These citations are derived from selected sources. This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically). | 10 | |
| popularity This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network. | Average | |
| influence This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically). | Top 10% | |
| impulse This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network. | Average |
