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

Limit[ E^(a x), x->-Infinity]

  • To: mathgroup at smc.vnet.net
  • Subject: [mg8970] Limit[ E^(a x), x->-Infinity]
  • From: phbrf at t-online.de (Peter Breitfeld)
  • Date: Mon, 6 Oct 1997 01:59:39 -0400
  • Organization: Telekom Online Internet Gateway
  • Sender: owner-wri-mathgroup at wolfram.com

How can I teach MMa to calculate

Limit[ Exp[a x], x-> -Infinity]=0

I tried 
    a/: Positive[a]=True
but this didn't help. MMa still thinks a to be possibly a complex or a
negative number and returns E^(a -Infinity).
any ideas?

- Peter

  +======_/_/_/_/===_/_/_/_/===_/_/_/_/== Peter Breitfeld ===========+
  |     _/     _/  _/     _/  _/          Kreuzgasse 4               |
  |    _/_/_/_/   _/_/_/_/   _/_/_/       88348 Saulgau / GERMANY    |
  |   _/     _/  _/   _/    _/            eMail: phbrf at t-online.de   |   
  +==_/_/_/_/===_/=====_/==_/============(PGP Public Key available)==+
 





  • Prev by Date: Parsing polygon lists
  • Next by Date: Re: Subscripts??
  • Previous by thread: Re: Parsing polygon lists
  • Next by thread: ReadList