RE: Integrate: A feature or a bug?
- To: mathgroup at smc.vnet.net
- Subject: [mg34272] RE: [mg34248] Integrate: A feature or a bug?
- From: "DrBob" <majort at cox-internet.com>
- Date: Mon, 13 May 2002 05:54:16 -0400 (EDT)
- Reply-to: <drbob at bigfoot.com>
- Sender: owner-wri-mathgroup at wolfram.com
Your answers are correct... you need to upgrade! Bobby -----Original Message----- From: Vladimir Bondarenko [mailto:vvb at mail.strace.net] To: mathgroup at smc.vnet.net Subject: [mg34272] [mg34248] Integrate: A feature or a bug? Hello, I have a fairly old version of Mathematica. It produces In[1] := Integrate[Integrate[Integrate[Integrate[1/(4 - (x + y + z + w)), {x, 1, 2}], {y, 1, 2}], {z, 1, 2}], {w, 1, 2}] Out[1] = Integrate[Integrate[Integrate[If[w + y + z < 2 || Im[w + y + z] != 0 || w + y + z > 4 && w + y + z > 4, Log[(-3 + w + y + z)/(-4 + w + y + z)] - Log[(-2 + w + y + z)/(-4 + w + y + z)], Integrate[(4 - w - x - y - z)^(-1), {x, 1, 2}, Assumptions -> Im[w + y + z] == 0 && w + y + z >= 2 && w + y + z <= 4]], {y, 1, 2}], {z, 1, 2}], {w, 1, 2}] Is is a feature or a bug? Can anybody interpret the output? My idea, the answer is ((-176*Log[2])/3 + 36*Log[3])/2 -0.557296 New version 4.1 produces NIntegrate[Integrate[Integrate[Integrate[1/(4 - (x + y + z + w)), {x, 1, 2}], {y, 1, 2}], {z, 1, 2}], {w, 1, 2}] -0.557296 Thank you in advance. Vladimir Bondarenko