Oh, I see, thanks. It is definitely not "Due to numerical instability",
though. This should be fixed in the patch.
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* Eviatar [2011-12-16 20:22:37 -0800]:
> sage: n(pi - 3).n(prec=2)
> 0.12
This approximates n(pi - 3) using two bits of precision so this should
not be too surprising:
sage: n(pi - 3)
0.141592653589793
sage: n(_, prec=2)
0.12
> sage: n(pi - 3, prec=2)
> 0.00
This approximates both pi and 3 with t
