Function: taylor
Section: polynomials
C-Name: tayl
Prototype: GnP
Help: taylor(x,y): taylor expansion of x with respect to y.
Doc: Taylor expansion around $0$ of $x$ with respect to
 the simple variable $y$. $x$ can be of any reasonable type, for example a
 rational function. The number of terms of the expansion is transparent to the
 user in GP, but must be given as a second argument in library mode.
