Hilbert Matrix
A matrix 
with elements
 |
(1)
|
for 
, 2, ..., 
. Hilbert matrices
are implemented in the Wolfram Language
by HilbertMatrix[m,
n]. The figure above shows a plot of the 
Hilbert
matrix with elements colored according to their values.
Hilbert matrices whose entries are specified as machine-precision numbers are difficult to invert using numerical techniques.
The determinants for the first few values of 
for 
, 2, ... are
given by one divided by 1, 12, 2160, 6048000, 266716800000, ... (OEIS A005249).
The terms of sequence have the closed form
 |  |  |
(2)
|
 |  |  |
(3)
|
 |  |  |
(4)
|
where 
is the Glaisher-Kinkelin
constant and 
is the Barnes
G-function. The numerical values are given in the following table.
 | det( ) |
| 1 | 1 |
| 2 |  |
| 3 |  |
| 4 |  |
| 5 |  |
| 6 |  |
The elements of the matrix inverse of the 
Hilbert matrix are given analytically by
 |
(5)
|
(Choi 1983, Richardson 1999).
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hilbert matrix
