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RE: Limit Question

• To: mathgroup at smc.vnet.net
• Subject: [mg66469] RE: [mg66452] Limit Question
• From: "David Park" <djmp at earthlink.net>
• Date: Sun, 14 May 2006 02:58:17 -0400 (EDT)
• Sender: owner-wri-mathgroup at wolfram.com

Jerry,

It seems that in some cases Assuming beforehand is better than Simplifying
afterwards.

Assuming[a > 0, Limit[Exp[-a t], t -> Infinity]]
0

Assuming[a < 0, Limit[Exp[-a t], t -> Infinity]]
Infinity

David Park
djmp at earthlink.net
http://home.earthlink.net/~djmp/


From: Blimbaum, Jerry CIV NSWC PC [mailto:jerry.blimbaum at navy.mil]
To: mathgroup at smc.vnet.net


Why do these give no output?

Simplify[Limit[Exp[-a t],t->Infinity],a>0]

and  same for

Simplify[Limit[Exp[a t],t->Infinity],a<0]

thanks...

Jerry Blimbaum