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Re: LaplaceTransform bug?

• To: mathgroup at smc.vnet.net
• Subject: [mg86303] Re: [mg86241] LaplaceTransform bug?
• From: Bob Hanlon <hanlonr at cox.net>
• Date: Sat, 8 Mar 2008 05:39:33 -0500 (EST)
• Reply-to: hanlonr at cox.net

$Version

6.0 for Mac OS X x86 (64-bit) (February 7, 2008)

$ReleaseNumber

2

Clear[a, b, t, s];
LaplaceTransform[E^(a t) E^(b t), t, s] // InputForm

-(a + b - s)^(-1)

LaplaceTransform[E^((a + b) t), t, s] // InputForm

(-a - b + s)^(-1)

% == %% // Simplify

True


Bob Hanlon

---- janus <januswesenberg at gmail.com> wrote: 
> As far as I can tell, the bug illustrated by the example below has not
> been reported in this group before.
> Does anybody know wether it has been fixed in v6.0.1?
> 
> In[1]:= $Version
> 
> Out[1]= "6.0 for Mac OS X x86 (32-bit) (April 20, 2007)"
> 
> In[2]:= Clear[a, b, t, s];
> LaplaceTransform[E^(a t) E^(b t), t, s] // InputForm
> 
> Out[3]//InputForm=
> E^(b*t)/(-a + s)
> 
> In[4]:= Clear[a, b, t, s];
> LaplaceTransform[E^((a + b) t), t, s] // InputForm
> 
> Out[5]//InputForm=
> (-a - b + s)^(-1)
>