Function: mathilbert
Section: linear_algebra
C-Name: mathilbert
Prototype: L
Help: mathilbert(n): Hilbert matrix of order n.
Doc: $x$ being a \kbd{long}, creates the
 \idx{Hilbert matrix}of order $x$, i.e.~the matrix whose coefficient
 ($i$,$j$) is $1/ (i+j-1)$.
