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MathGroup Archive 2000

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Re: Another strange bug in Mathematica 4.0's Integrate

  • To: mathgroup at smc.vnet.net
  • Subject: [mg25371] Re: Another strange bug in Mathematica 4.0's Integrate
  • From: Hendrik van Hees <h.vanhees at gsi.de>
  • Date: Sun, 24 Sep 2000 16:29:06 -0400 (EDT)
  • Organization: GSI Darmstadt
  • References: <8q21lp$hoh@smc.vnet.net> <ztgz5.89556$Zh6.152771@ralph.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

It's funny what the CA-fans argue and don't admit that a bug is a bug.
If I put in

Integrate[Sqrt[r^2-x^2],{x,-r,r},Assumptions->{r>0}]

this is a well defined expression in terms of a real integral. The
square root is positive because the principle value is realised
(according to the online documentation). Further as long as I do not
tell the path of integration it must be a real integral, otherwise
Integrate is not well defined!


-- 
Hendrik van Hees		Phone:  ++49 6159 71-2751
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D-64291 Darmstadt		http://theory.gsi.de/~vanhees/index.html


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