Did I something wrong?

*To*: mathgroup at smc.vnet.net*Subject*: [mg24391] Did I something wrong?*From*: Markus Schick <markus.schick at eplus-online.de>*Date*: Wed, 12 Jul 2000 23:13:32 -0400 (EDT)*Sender*: owner-wri-mathgroup at wolfram.com

In[1]:= FourierCosTransform[UnitStep[1 - x^2 - y^2], {x, y}, {u, v}] Out[1]= {{Sqrt[2 Pi] DiracDelta[u] UnitStep[x] UnitStep[1 - x^2 - y^2], Sqrt[2 Pi] DiracDelta[v] UnitStep[x] UnitStep[1 - x^2 - y^2]}, {Sqrt[2 Pi] DiracDelta[u] UnitStep[y] UnitStep[1 - x^2 - y^2], Sqrt[2 Pi] DiracDelta[v] UnitStep[y] UnitStep[1 - x^2 - y^2]}} Why haven't x ynd y vanished? This Result doesn't make much sense to me. I had expected something like: Out[1]= BesselJ[1,Sqrt[u^2+v^2]]/(2 Sqrt[u^2+v^2]) I use Mathematica 4.0 for Students on a Powermac Thank you for looking at it. Regards Markus