Hello,
I get an error message when trying to compare some algebraic numbers.
Here is the simplest example I could get:
{{{
#!python
sage: M = matrix(3, [0,0,1,1,0,1,0,1,0])
sage: x = vector([0,0,1])
sage: y = M.eigenvectors_left()[1][1][0]
sage: z = M.eigenvectors_left()[2][1][0]
sage: a = abs(x*y)
sage: b = abs(x*z)
sage: a
0.7548776662466928?
sage: b
0.7548776662466928?
sage: a == b # crashes
[...]
TypeError: Unable to convert number to real interval.
sage: a*a == a*a # crashes
[...]
TypeError: Unable to convert number to real interval.
sage: a == a #this works
True
}}}
Thanks in advance,
Timo
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