Bessel_j(0,x) is analytic at 0 yet
(%i1) taylor(bessel_j(0,x),x,0,2);
`taylor' encountered an unfamiliar singularity in:
Taylor has no problem expanding bessel_j at 1:
(%i2) taylor(bessel_j(0,x),x,1,2);
(%o2) < junk deleted>
I think the problem with the expansion at zero is
the derivative of bessel_j(0,x) is
(%i3) diff(bessel_j(0,x),x,2);
(%o3) bessel_j(1,x)/x-bessel_j(0,x)
Trying to evaluate this at zero causes problems.
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Fixed in bessel.lisp CVS r 1.39