BesselY(n,x)
BesselY_n x
i1 : BesselY_0 .5 o1 = -.444518733506707 o1 : RR (of precision 53)
i2 : BesselY_2 3p200 o2 = -.160400393484923729675768299537980918104012040174378220981908 o2 : RR (of precision 200)
See Bessel function.
The object BesselY is a method function.