Groups > comp.soft-sys.math.mathematica > #1453

Integrate gives wrong results for a simple polynomial

From	Micket <micketeer@gmail.com>
Newsgroups	comp.soft-sys.math.mathematica
Subject	Integrate gives wrong results for a simple polynomial
Date	2011-04-04 10:29 +0000
Organization	Steven M. Christensen and Associates, Inc and MathTensor, Inc.
Message-ID	<inc6io$rv$1@smc.vnet.net> (permalink)

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I have had the bad luck to discover a strange bug (?) when computing
some integrals with mathematica.
I simplified it as far as i could;
$Assumptions = p > 0; Integrate[Subscript[x, 1]*(1 + y)^2, {y, -1, 1}]

If i change anything else, be it the assumption (yes, it is a
completely unrelated variable), the subscript, the integration limits,
the exponent, the addition, it works out the correct answer.

It also takes a significant time (a few seconds) to compute this
integral.

Does anyone have an explanation for this behavior?

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Integrate gives wrong results for a simple polynomial Micket <micketeer@gmail.com> - 2011-04-04 10:29 +0000

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