agree .
sum of irrationals are unknown . nothing can be commented ..

On Mon, Mar 5, 2012 at 9:30 AM, Chris Smith <[email protected]> wrote:

> sums of irrationals are unknown
>
>     >>> (sqrt(2)+sqrt(3)).is_rational
>     >>> (sqrt(3)+sqrt(5)).is_rational
>
> 2*irrational is irrational
>
>     >>> (sqrt(3)+sqrt(3)).is_rational
>     False
>
> When irrationals cancel, a rational remains
>
>     >>> ((2-sqrt(2))+sqrt(2)).is_rational
>     True
>
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