Series[] problem
- To: mathgroup at smc.vnet.net
- Subject: [mg18420] Series[] problem
- From: Attico Nicola <nicola at Linuz.sns.it>
- Date: Wed, 7 Jul 1999 00:11:14 -0400
- Sender: owner-wri-mathgroup at wolfram.com
Hi,
I post a little problem with the
command Series[].
Someone can explain me why this stupid
result?
Or I, im stupid?
It's true that one can find the same way
to do the same thing without errors,
but i find it strange...
Bye
Nicola
******************************************************
In[1]:= Series[BesselK[n,x],{x,Infinity,2}]
2 Pi 1 3/2
(-1 + 4 n ) Sqrt[--] (-)
Pi 1 2 x
Out[1]= (Sqrt[--] Sqrt[-] + --------------------------- +
2 x 8
2 2 Pi 1 5/2
(-9 + 4 n ) (-1 + 4 n ) Sqrt[--] (-)
2 x 1 7/2 x
> --------------------------------------- + O[-] ) / E
128 x
In[2]:= Series[BesselK[n,x/2],{x,Infinity,2}]
x 1 2
Series::esss: Essential singularity encountered in BesselK[n, - + O[-] ].
2 x
x 1 2
Out[2]= BesselK[n, - + O[-] ]
2 x
*********************************************