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MathGroup Archive 2007

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Series of LaguerreL problem

  • To: mathgroup at smc.vnet.net
  • Subject: [mg72785] Series of LaguerreL problem
  • From: Arturas Acus <acus at itpa.lt>
  • Date: Fri, 19 Jan 2007 02:09:38 -0500 (EST)

Dear Group,


Using 5.2 version and looking at the help browser on LaguerreL[]
function I see the following line

In[1]:=
Series[LaguerreL[n, z], {z, 0, 4}]

Out[1]:=
SeriesData[z, 0, {LaguerreL[n, 0], -LaguerreL[-1 + n, 1, 0],
LaguerreL[-2 + n, 2, 0]/2, -LaguerreL[-3 + n, 3, 0]/6, LaguerreL[-4 + n,
4, 0]/24}, 0, 5, 1]

Does it have any sense? Certainly, I can call FunctionExpand[] on the
Normal[%]

The behaviour of version 5.0 was different and I suspect bug here.

Explanation/motivation or bug confirmation would be wellcome.


-- 
Arturas Acus <acus at itpa.lt>


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