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MathGroup Archive 2006

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RE: Integrate with multiple integrals -- bug?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg67417] RE: [mg67377] Integrate with multiple integrals -- bug?
  • From: "David Park" <djmp at earthlink.net>
  • Date: Thu, 22 Jun 2006 06:22:05 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

This appears to be fixed in Mathematica 5.2

David Park
djmp at earthlink.net
http://home.earthlink.net/~djmp/ 

From: Martin Schoenecker [mailto:ms_usenet at gmx.de]
To: mathgroup at smc.vnet.net

Hello,

I am wondering where my or Mathematica's error in reasoning lies:

In[1]:= Integrate[g[z], {x, 0, a}]
Out[1]= a*g[z]

ok, because the function g does not depend on x.

In[2]:= Integrate[g[z], {z, 0, c}]
Out[2]= Integrate[g[z], {z, 0, c}]

ok, function g is not specified at the moment.

In[3]:= Integrate[g[z], {z, 0, c}, {x, 0, a}]
Out[3]= Integrate[a*g[z], {z, 0, c}]

also ok.  Now with the integration order reversed:

In[4]:= Integrate[g[z], {x, 0, a}, {z, 0, c}]
Out[4]= a*g[z]

?? why this result ??



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