Category:Examples of Vandermonde Matrix Identity

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This category contains examples of use of Vandermonde Matrix Identity for Cauchy Matrix.

Assume values $\set {x_1, \ldots, x_n, y_1, \ldots, y_n}$ are distinct in matrix

\(\ds C\) \(=\) \(\ds \begin {pmatrix}
       \dfrac 1 {x_1 - y_1} & \dfrac 1 {x_1 - y_2} & \cdots & \dfrac 1 {x_1 - y_n} \\
       \dfrac 1 {x_2 - y_1} & \dfrac 1 {x_2 - y_2} & \cdots & \dfrac 1 {x_2 - y_n} \\
       \vdots               & \vdots               & \cdots & \vdots \\
       \dfrac 1 {x_n - y_1} & \dfrac 1 {x_n - y_2} & \cdots & \dfrac 1 {x_n - y_n} \\

\end {pmatrix}\)

Cauchy matrix of order $n$

Then:

\(\ds C\) \(=\) \(\ds -P V_x^{-1} V_y Q^{-1}\) Vandermonde matrix identity for a Cauchy matrix