Am Donnerstag, den 10.11.2011, 12:00 -0800 schrieb Edwin Woollett:
>
> Hence the feature request:
>
> Add imagpart knowledge to bessel_y code
> and simplification.
>
> Ted Woollett
The imaginary part of bessel_y(n,x) is zero only for a positive argument
x. Maxima already has this knowledge:
(%i1) imagpart(bessel_y(1, x));
(%o1) imagpart(bessel_y(1, x))
(%i2) assume(x>0);
(%o2) [x > 0]
(%i3) imagpart(bessel_y(1, x));
(%o3) 0
Dieter Kaiser