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