Surprinsingly, SAGE 3.1.2 is more ignorant than 3.1.1:
> ./sage
-----------------------------------
| SAGE Version 3.1.2 ...
| Type notebook() ...
----------------------------------
sage: var('a b t x')
(a, b, t, x)
sage: assume(exp(b*pi)<1)
sage: expr(x)=integral(exp(-2*I*pi*(a+I*b)*t),t,0,x)
sage: factor(limit(expr(x),x=infinity))
-1*I/(2*pi*(I*b+a))
SAGE doesn't know anymore that exp() is strictly ascending.
(assume(b<0) doesn't work anymore)
On 22 sep, 12:30, kkwweett <[EMAIL PROTECTED]> wrote:
> you can indirectly get
>
> > ./sage
>
> -----------------------------------
> | SAGE Version 3.1.1 ...
> | Type notebook() ...
> ----------------------------------
>
> sage: var('a b t x')
> (a, b, t, x)
> sage: assume(b<0)
> sage: expr(x)=integral(exp(-2*I*pi*(a+I*b)*t),t,0,x)
> sage: factor(limit(expr(x),x=infinity))
> -1*I/(2*pi*(I*b+a))
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