problem with InverseLaplaceTransform

• To: mathgroup at smc.vnet.net
• Subject: [mg57985] problem with InverseLaplaceTransform
• From: "Barry Shaw" <barry.shaw at qub.ac.uk>
• Date: Wed, 15 Jun 2005 05:58:20 -0400 (EDT)
• Sender: owner-wri-mathgroup at wolfram.com

```Hi,

I'm pretty new to Mathematica and am having difficulty trying to derive
an inverse laplace transform using Mathematica.  When I run the code,
Mathematica starts to run (says "running..."), but then just continues
to remain like that and doesn't give an answer....as if it has crashed
or something.  The code I`m trying to run is below (layout messed up,
but if you copy and paste it back into Mathemtica it`s fine):

InverseLaplaceTransform[{{(muone (mufour + s) (lambdathree + muthree +

s) (lambdatwo + mutwo + s) +

lambdaone (lambdathree (lambdatwo mufour +

mutwo (mufour + s)) + (mufour +

s) (lambdatwo muthree +

mutwo (muthree + s))))/(s (mufour + s)
(lambdaone +

muone + s) (lambdathree + muthree + s) (lambdatwo +
mutwo +

s) (1 - (muone (mufour + s) (lambdathree + muthree +

s) (lambdatwo + mutwo + s) +

lambdaone (lambdathree (lambdatwo mufour +

mutwo (mufour + s)) + (mufour +

s) (lambdatwo muthree +

mutwo (muthree + s))))/((mufour +

s) (lambdaone + muone + s) (lambdathree +
muthree +

s) (lambdatwo + mutwo + s))))}}, s, t]

Can anybody explain my problem?

Thanks,

Barry

```

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