New in Wolfram Mathematica 6: New Classes of Special Functions  previous | next 
Spheroidal Functions
Mathematica 6 adds general handling of spheroidal functions.
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Click for copyable input
Plot3D[Im[SpheroidalPS[3, 1, 1, x + I y]], {x, -3, 3}, {y, -2, 2}, 

 Exclusions -> {{y == 0, x^2 > 1}}]
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