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A Bug or not a bug?

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  • Subject: [mg74883] A Bug or not a bug?
  • From: "dimitris" <dimmechan at>
  • Date: Tue, 10 Apr 2007 05:12:45 -0400 (EDT)

This appears in another forum.
(Actually the third integral below. The discoverer regards it as a
The first two integrals are part of my response to him).

Integrate[Exp[x], {x, -Infinity, 0}] (*correct*)

Integrate[Exp[x], {x, 0, Infinity}]  (*correct*)
Integrate::idiv: Integral of E^x does not converge on {0, Infinity}.
Integrate[Exp[x], {x, 0, Infinity}]

Integrate[Exp[x], {x, -Infinity, 0}, Assumptions -> x < 0]
Integrate::idiv: Integral of E^(-x) does not converge on
Integrate[E^x, {x, -Infinity, 0}, Assumptions -> x < 0]

Since my experience about what must be regarded as a bug/feature is
not so
big as others in this forum I would like to see what you think about
the last
performance of Mathematica.

I personally don't regard it as a serious bug. It is like trying to
"cheat" Mathematica.
I am sure there are a great many ways to make built in functions to
give wrong results!
And what is more important the unecessary setting of Assumptions
caused it!

Your Opinion?


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