Re: limit problem

*To*: mathgroup at smc.vnet.net*Subject*: [mg58924] Re: limit problem*From*: "David W. Cantrell" <DWCantrell at sigmaxi.org>*Date*: Sun, 24 Jul 2005 01:21:46 -0400 (EDT)*References*: <dbt3lm$sk4$1@smc.vnet.net>*Sender*: owner-wri-mathgroup at wolfram.com

Chris Chiasson <chris.chiasson at gmail.com> wrote: > Dear MathGroup, > Honestly, I see no reason why this should return "unevaluated" instead of > zero. > > FullSimplify[Limit[E^(-R t),t\[Rule]Infinity],Infinity>R>0&&Element[R, > Reals]] > > 5.2 on windows That seems like a good point. My guessplanation is that perhaps conditions given for Simplify or FullSimplify are not used inside of Limit. Note that one need not even ask for simplification if, _prior_ to asking for the limit, it is specified that 0 < R < Infinity: In[4]:= Assuming[0 < R < Infinity, Limit[E^(-R t), t -> Infinity]] Out[4]= 0 using version 5.1 on Windows. David