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)"