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Re: Mathematica not simplifying Laplace transforms

• To: mathgroup at smc.vnet.net
• Subject: [mg61371] Re: Mathematica not simplifying Laplace transforms
• From: Jean-Marc Gulliet <jeanmarc.gulliet at gmail.com>
• Date: Mon, 17 Oct 2005 02:29:37 -0400 (EDT)
• Organization: The Open University, Milton Keynes, UK
• References: <diskoi$m9b$1@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

Roger wrote:

> 2) This might be related, how do I define the domain of a variable?
> Like making the variable "t" a positive real number.

Hi Roger,

You can try the clause *Assumptions* (although that does not change 
anything in this case):

In[1]:=
LaplaceTransform[Exp[t]*f[t], t, s, Assumptions -> t > 0]

Out[1]=
LaplaceTransform[E^t*f[t], t, s, Assumptions -> t > 0]