On Monday, July 3, 2017 at 12:00:03 PM UTC+2, LudJam wrote:
>
> I think I discovered a case where bool() of a symbolic expression returns 
> false while it is true :
>
> bool(sqrt(-4*x+4)==sqrt(-x+1)*2)
> >>false
>

That is not a bug. False can mean False and Unknown here.
Blame Python for the fact that we cannot express tri-state logic in Sage.

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