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Re: Bad Laplace Transform

  • To: mathgroup at smc.vnet.net
  • Subject: [mg96176] Re: Bad Laplace Transform
  • From: "Chris H. Fleming" <chris_h_fleming at yahoo.com>
  • Date: Sat, 7 Feb 2009 03:41:44 -0500 (EST)
  • References: <gmgusn$302$1@smc.vnet.net>

On Feb 6, 4:11 am, "Chris H. Fleming" <chris_h_flem... at yahoo.com>
wrote:
> When I try to inverse Laplace transform
>
> 1/(sqrt(s)-r)
>
> from L[f](s) to f(t), I believe the result is generally incorrect.
>
> Upon transforming back to the Laplace domain Mathematica does not give
> the original function unless the constant 'r' is real and nonpositive.
>
> I've tried this in Mathematica 6 and 7.


After some more checking, I think the inverse Laplace transform is ok,
but obviously something bad is happening when I reapply the Laplace
transform and do not get the original function.


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