MathGroup Archive 2002

[Date Index] [Thread Index] [Author Index]

Search the Archive

When does Integrate give incorrect results?


Is there any guide as to when Mathematica gives incorrect
results for an integral?  For example,

Integrate[ 1/(1 + x^2y^2), {x, 0, Infinity}, {y, 0, x} ]

returns 0.
I'm guessing Mathematica tries to expand the integrand
as partial fractions, but has difficulties with branch points
-- is that correct?


  • Prev by Date: dynamical systems
  • Next by Date: Fourier transform of the delta function
  • Previous by thread: dynamical systems
  • Next by thread: Fourier transform of the delta function