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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 ===========+
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  |   _/     _/  _/   _/    _/            eMail: phbrf at t-online.de   |   
  +==_/_/_/_/===_/=====_/==_/============(PGP Public Key available)==+
 





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