In the doc of sage.rings.qqbar.AlgebraicRealField._coerce_map_from_
there is the following test:
sage: K.<a> = QuadraticField(7, embedding=AA(7).sqrt())
sage: AA.has_coerce_map_from(K)
True
Why does this return (correctly) True, although the code of this method
is simply
def _coerce_map_from_(self, from_par):
return (from_par is ZZ or from_par is QQ
or from_par is AA)
?
Best
Daniel
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