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Re: Strange Laplace Transform in 6.0

  • To: mathgroup at smc.vnet.net
  • Subject: [mg81799] Re: Strange Laplace Transform in 6.0
  • From: Fred Bartoli <mynamewithAdotinbetween at free.fr>
  • Date: Wed, 3 Oct 2007 06:16:10 -0400 (EDT)
  • References: <fdt58v$sp4$1@smc.vnet.net>

Le Tue, 02 Oct 2007 10:07:27 +0000, C. Seja a =C3=A9crit:

> Hi,
>
> just have a look at this:
>
> Mathematica 5.2:
>
> In[3]:=
>  LaplaceTransform[Exp[x^2]*Exp[a*x],x,s]
>
> Out[3]=
> \!\(1\/2\ \[ExponentialE]\^\(\(-\(1\/4\)\)\ \((a - s)\)\^2\)\ \@?\
> Erfi[1\/2\ \
> \((\(-a\) + s)\)]\)
>
>
> Mathematica 6.0:
>
> In[1]:= LaplaceTransform[Exp[x^2]*Exp[a*x], x, s] Out[1]=
> \[ExponentialE]^x^2/(-a + s)
>
>
> Why does 6.0 give this result? Am I missing something?
>

Even more strange (6.0.1/Linux64):

In[1]:= LaplaceTransform[Exp[x(x+a )],x,s]
Out[1]= LaplaceTransform[1,x,-a+s-x]


--
Thanks,
Fred.


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