Here is a bug: one should be able to coerce the element that created
the number field into the number field:
sage: R = QQ[sqrt(2)]
sage: R(sqrt(2))
Traceback
...
TypeError: <class 'sage.calculus.calculus.SymbolicComposition'>
I came across this while playing around: I was trying to build a
number field containing sqrt(2), sqrt(3), ..., sqrt(n) to speed up
some code that needs to work with sqrts. If you have any suggestions,
that would be cool.
Franco
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