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MathGroup Archive 2007

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  • To: mathgroup at smc.vnet.net
  • Subject: [mg80065] question
  • From: dimitris <dimmechan at yahoo.com>
  • Date: Sat, 11 Aug 2007 02:21:33 -0400 (EDT)

Let's see if Mathematica 6 has become better.

In Mathematica 5.2 (and as well 6; as it
was mentioned in a recent thread).

In[11]:=
FourierTransform[Sign[y]*Sign[y], y, q]

Out[11]=
Sqrt[2*Pi]*DiracDelta[q]

which is correct.

In Mathematica 5.2

In[5]:=
FourierTransform[Sign[y]*Sign[a*y], y, q]

Out[5]=
(1/q)*((I*(1 - E^(I*q*Sqrt[1/Integrate`NLtheoremDump`myMax[0,
0]^2]*Integrate`NLtheoremDump`myMax[0, 0]^2) +
     E^(2*I*q*Sqrt[1/Integrate`NLtheoremDump`myMax[0,
0]^2]*Integrate`NLtheoremDump`myMax[0, 0]^2))*Sqrt[2/Pi]*
    (2 + DiscreteDelta[a] - UnitStep[-a] - UnitStep[a]))/E^(I*q*Sqrt[1/
Integrate`NLtheoremDump`myMax[0, 0]^2]*
     Integrate`NLtheoremDump`myMax[0, 0]^2))

I think outputs like this is a mini nightmare for the developers.

What does version 6 returns?

Thanks
Dimitris



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