Re: Bug with Integrate in v7?
- To: mathgroup at smc.vnet.net
- Subject: [mg103192] Re: Bug with Integrate in v7?
- From: psycho_dad <s.nesseris at gmail.com>
- Date: Thu, 10 Sep 2009 07:20:25 -0400 (EDT)
- References: <h859sa$pva$1@smc.vnet.net> <h87pdf$5f6$1@smc.vnet.net>
Funny, I generalized the expression by replacing the exponent in z-1
with an arbitrary constant:
f=(x-1)^2(y-1)^2 (z-1)^a;
and then both integrations fail in v7:
Integrate[f,{x,-1,1},{y,-1,1},{z,-1,1}]
0
Integrate[Integrate[Integrate[f,{x,-1,1}],{y,-1,1}],
{z,-1,1},Assumptions->a>0]
0
while in v6 they both give:
((-1)^a 2^(7 + a))/(9 (1 + a))
for a->2 this gives 512/27
I would expect that tests like this should be done before a new
version is released...