Status: Accepted
Owner: asmeurer
CC: [email protected]
Labels: Type-Defect Priority-Medium Polynomial
New issue 2550 by asmeurer: Bug with AlgebraicNumber.__eq__
http://code.google.com/p/sympy/issues/detail?id=2550
This came up at https://github.com/sympy/sympy/pull/480. There is a bug
with AlgebraicNumber.__eq__. First, it assumes that the `other` term is an
Expr object.
Second, this does not work
In [2]: AlgebraicNumber(1) == S(1)
Out[2]: False
Even though we usually get
In [10]: AlgebraicNumber(sqrt(2)) == sqrt(2)
Out[10]: True
It's because
In [13]: AlgebraicNumber(1)
Out[13]: 1
In [14]: to_number_field(1, AlgebraicNumber(1))
Out[14]: 1
In [15]: AlgebraicNumber(1).rep
Out[15]: DMP([mpq(1,1), mpq(0,1)], QQ)
In [16]: to_number_field(1, AlgebraicNumber(1)).rep
Out[16]: DMP([mpq(1,1)], QQ)
And AlgebraicNumber.__eq__ compares the rep values.
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