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MathGroup Archive 2006

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Re: Integrate with multiple integrals -- bug?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg67418] Re: [mg67377] Integrate with multiple integrals -- bug?
  • From: gardyloo <gardyloo at mail.wsu.edu>
  • Date: Thu, 22 Jun 2006 06:22:07 -0400 (EDT)
  • References: <200606210612.CAA08849@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Hi, Martin,

    Mathematica 5.2 (on Linux), and 5.1 (on Windows) give the expected
result (that is, the output of your In[4] gives the same as your Out[3]
). Perhaps this is a bug which is fixed in newer versions?

          Best,
                   Curtis O.

Martin Schoenecker wrote:
> 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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Curtis Osterhoudt          
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