       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:= Integrate[g[z], {x, 0, a}]
> Out= a*g[z]
>
> ok, because the function g does not depend on x.
>
> In:= Integrate[g[z], {z, 0, c}]
> Out= Integrate[g[z], {z, 0, c}]
>
> ok, function g is not specified at the moment.
>
> In:= Integrate[g[z], {z, 0, c}, {x, 0, a}]
> Out= Integrate[a*g[z], {z, 0, c}]
>
> also ok.  Now with the integration order reversed:
>
> In:= Integrate[g[z], {x, 0, a}, {z, 0, c}]
> Out= a*g[z]
>
> ?? why this result ??
>
Wrong version ;-)

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

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

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

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