Services & Resources / Wolfram Forums
-----
 /
MathGroup Archive
1997
*January
*February
*March
*April
*May
*June
*July
*August
*September
*October
*November
*Archive Index
*Ask about this page
*Print this page
*Give us feedback
*Sign up for the Wolfram Insider

MathGroup Archive 1997

[Date Index] [Thread Index] [Author Index]

Search the Archive

MMA3.0.0 bug in symbolic summation

  • To: mathgroup at smc.vnet.net
  • Subject: [mg8969] MMA3.0.0 bug in symbolic summation
  • From: luca ciotti <ciotti at boas5.bo.astro.it>
  • Date: Mon, 6 Oct 1997 01:59:38 -0400
  • Organization: Osservatorio Astronomico di Bologna
  • Sender: owner-wri-mathgroup at wolfram.com

Dear Users, 

I found a problem in symbolic summation using MMA 3.0.0.

 A = Sum[ Exp[-k]/(1+k^3), {k,0,Infinity}]

The analitycal result, when evaluated numerically  is

                          N[A,50] = 0.5344386.....


This is obviously wrong, in fact each term of the series is 
positive, and the first (k=0) is equal 1.

Performing directly NSum, return 1.20111.....


Is this bug still present in MMA3.0.1? 

luca ciotti
osservatorio astronomico di bologna
via zamboni 33, 40126 Bologna (italy)


  • Prev by Date: Re: prograMing: split a list
  • Next by Date: Modify data to satisfy constraints
  • Previous by thread: Handling data and Images
  • Next by thread: Re: MMA3.0.0 bug in symbolic summation