Function: besseli
Section: transcendental
C-Name: ibessel
Prototype: GGp
Help: besseli(nu,x): I-bessel function of index nu and argument x.
Doc: $I$-Bessel function of index \var{nu} and
 argument $x$. If $x$ converts to a power series, the initial factor
 $(x/2)^{\nu}/\Gamma(\nu+1)$ is omitted (since it cannot be represented in PARI
 when $\nu$ is not integral).
