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MathGroup Archive 2006

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Re: Integrate with multiple integrals -- bug?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg67408] Re: Integrate with multiple integrals -- bug?
  • From: Peter Pein <petsie at dordos.net>
  • Date: Thu, 22 Jun 2006 06:21:33 -0400 (EDT)
  • References: <e7aoij$8ua$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Martin Schoenecker schrieb:
> 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 ??
> 
Wrong version ;-)

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

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

In[5]:= $Version
Out[5]= "5.2 for Linux x86 (64 bit) (June 20, 2005)"


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