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Re: large integration result for simple problem: 1/x,, also BesselJ

• To: mathgroup at smc.vnet.net
• Subject: [mg122888] Re: large integration result for simple problem: 1/x,, also BesselJ
• From: Ralph Dratman <ralph.dratman at gmail.com>
• Date: Mon, 14 Nov 2011 07:08:12 -0500 (EST)
• Delivered-to: l-mathgroup@mail-archive0.wolfram.com

Question: Integrate[1/x, {x, a, b},  Assumptions ->  a \[Element]
Reals && b \[Element] Reals && a > 0 && b > 0 && b > a]

Answer: Reals Log[b/a]

Mathematica can't very well assume you only want to deal with the
simplest case unless you so specify. If it did that, it would be
producing wrong answers in more inclusive cases.

Ralph


> try
> Integrate[1/x,{x,a,b}]