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roots of BesselJPrimes


hello!

I'm trying to find the first 20 roots of the derivation of a
Besselfunction of the first kind,
first order.  The BesselJPrimeZeros-function doesn't work while for
example
BesselYPrimeZeros does.
I'm working with mathematica3.0 on a sparc 10 computer.

Example for in- and outputs:

In[31]:=
BesselYPrimeZeros[1,{1,3}]

Out[31]=
{3.68302,6.9415,10.1234}

but:

In[32]:=
BesselJPrimeZeros[1,{1,3}]

Out[32]=
BesselJPrimeZeros[1,{1,3}]


Does this problem occured to someone?

all help thanked,

Christian



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