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Re: inverse command of Series[]

  • To: mathgroup at smc.vnet.net
  • Subject: [mg8057] Re: [mg8020] inverse command of Series[]
  • From: "w.meeussen" <meeussen.vdmcc at vandemoortele.be>
  • Date: Mon, 4 Aug 1997 01:47:40 -0400
  • Sender: owner-wri-mathgroup at wolfram.com

hi,

Check the DiscreteMath package for Exponential generating functions

In[2]:=
<<DiscreteMath`RSolve`
In[6]:=
Sum[x^n/n!,{n,0,Infinity}]
Out[6]=
 x
E
In[8]:=
ExponentialPowerSum[1,{x,0}]
Out[8]=
 x
E

and so on ...
wouter.



 22:32 2-08-97 -0400, Nguyen N. Anh wrote:
>Hello,
>
>I've written a program in Mathematica and it works quite well. However, after
>convergence it gave as  result the following polinomial:
>
>1 + x + x^2/2 + x^3/6 + x^4/24 + x^5/120 + x^6/720 + x^7/5040
>
>I know that this is the power series expansion of function E^x but I want that
>my program recognizes it automatically and  outputs the generating function of
>the polinomial calculated ( E^x in this case).
>
>Is there any command or package which can do that ?
>
>Any help will be appreciated
>
>Regards
>
>-- 
>Nguyen Nam Anh   Quebec, Canada
>E-mail: anh at chm.ulaval.ca
>WWW: http://promethium.chm.ulaval.ca/~anh/
>
>
>
>

Dr. Wouter L. J. MEEUSSEN
eu000949 at pophost.eunet.be
w.meeussen.vdmcc at vandemoortele.be



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