When does Integrate give incorrect results?
- To: mathgroup at smc.vnet.net
- Subject: [mg37460] When does Integrate give incorrect results?
- From: strgh at mimosa.csv.warwick.ac.uk ()
- Date: Thu, 31 Oct 2002 04:41:23 -0500 (EST)
- Organization: University of Warwick, UK
- Sender: owner-wri-mathgroup at wolfram.com
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?