Re: Please help!

*To*: mathgroup at smc.vnet.net*Subject*: [mg28650] Re: Please help!*From*: "Paul Lutus" <nospam at nosite.com>*Date*: Sat, 5 May 2001 04:00:37 -0400 (EDT)*References*: <9ctbb7$m4s@smc.vnet.net>*Sender*: owner-wri-mathgroup at wolfram.com

"Rex" <rex_chaos at 263.net> wrote in message news:9ctbb7$m4s at smc.vnet.net... > Dear Sir, > I wonder why I can't get the analytic form of the following integration by Mathematica: > In[1] = Y=Integrate[Exp[-T^2/(2T_0^2)]Exp[iwT], {T, -Infinity, > Infinity}] > In[2] = Integrate[YExp[beta2*w^2*z-iwT],{w,-Infinity,Infinity}] > Unforunately, the anwser given by Mathematica is the orginal formula > I input. The only problem with the first one is the variable name T_0 -- this form is not permitted in its position. Instead do this: Y=Integrate[Exp[-T^2/(2T0^2)]Exp[iwT], {T, -Infinity,Infinity}] This will produce a meaningful result AS POSTED (see below). There is no problem with the second AS POSTED: Z = Integrate[Y Exp[beta2*w^2*z-iwT],{w,-Infinity,Infinity}] Now, have you read the help files of acquired a Mathematica book? I ask because your input "iwT" is almost certainly three variables, not one, and if so, you must separate them with spaces. With Mathematica, as with most things, you need to learn how to use it, then use it. Also, it is important to say which version of Mathematica you have. -- Paul Lutus www.arachnoid.com