Re: Re: Limit Question

*To*: mathgroup at smc.vnet.net*Subject*: [mg66479] Re: [mg66459] Re: [mg66452] Limit Question*From*: "David Park" <djmp at earthlink.net>*Date*: Mon, 15 May 2006 23:49:08 -0400 (EDT)*Sender*: owner-wri-mathgroup at wolfram.com

And yes, the Mathematica Help for Limit DOES now say that Assumptions is an option - but it is interesting that almost everyone missed that and use the Assuming statement instead. And wondered why it worked! I guess it pays to read the Help carefully for newer features, such Assuming and $Assumptions. David Park djmp at earthlink.net http://home.earthlink.net/~djmp/ From: Carl K. Woll [mailto:carlw at wolfram.com] To: mathgroup at smc.vnet.net Blimbaum, Jerry CIV NSWC PC wrote: > 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 > > Try sticking the assumption inside of Limit: In[11]:= Limit[Exp[-a t], t -> Infinity, Assumptions -> a > 0] Out[11]= 0 In[12]:= Limit[Exp[a t], t -> Infinity, Assumptions -> a < 0] Out[12]= 0 Carl Woll Wolfram Research