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MathGroup Archive 2007

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Re: MathKernel Crash while calculating limit

  • To: mathgroup at smc.vnet.net
  • Subject: [mg75617] Re: MathKernel Crash while calculating limit
  • From: Jean-Marc Gulliet <jeanmarc.gulliet at gmail.com>
  • Date: Sun, 6 May 2007 02:00:12 -0400 (EDT)
  • Organization: The Open University, Milton Keynes, UK
  • References: <f1hla2$om6$1@smc.vnet.net>

Ulrik Günther wrote:
> Hi everybody,
> 
> during a calculation of a limit, MathKernel crashed. I tried the  
> following:
> 
> Limit[((-2^(n - 1)*M)/(n!*L^(n - 1)))^(n/2), n -> (infinity)]
-----------------------------------------------------^^^^^^^^
Spelling error: must be written Infinity (with a capital i)

> After some seconds, Mathematica produced a beep, then I got a crash  
> report concerning MathKernel. I attached a full crash log to this  
> mail. Oh, and I'm using Mathematica (for Students) 5.2 on a PowerBook  
> G4 running MacOS 10.4.9.
> Also tried calculating that limit without the constants L and M, this  
> time it worked.
> 
> Maybe somebody can explain that behaviour to me...
> 
> Thanks in advance,
> 
> ulrik
> 

No crash on my system.

(* With symbol infinity misspelled *)
In[1]:=
Limit[(((-2^(n - 1))*M)/(n!*L^(n - 1)))^(n/2), n -> infinity]

Out[1]=
     -1 + infinity  1 - infinity
    2              L             M  infinity/2
(-(------------------------------))
         Gamma[1 + infinity]

(* With correct syntax *)
In[2]:=
Limit[(((-2^(n - 1))*M)/(n!*L^(n - 1)))^(n/2), n -> Infinity]

Out[2]=
0

In[3]:=
$Version

Out[3]=
5.2 for Microsoft Windows (June 20, 2005)

Regards,
Jean-Marc


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