#10720: nth_root in power series
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Reporter: pernici | Owner: pernici
Type: PLEASE CHANGE | Status: new
Priority: minor | Milestone: sage-4.6.2
Component: commutative algebra | Keywords: power series
Author: mario pernici | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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Comment(by pernici):
in the above message there is a wrong example on where sqrt fails;
here is the corrected example
{{{
sage: R.<x,y> = QQ[]
sage: S.<t> = R[[]]
sage: p = 4 + t*x + t^2*y + O(t^3)
sage: p.nth_root(2)
2 + 1/4*x*t + (-1/64*x^2 + 1/4*y)*t^2 + O(t^3)
sage: p.sqrt()
Traceback (most recent call last):
...
AttributeError:
'sage.rings.polynomial.multi_polynomial_libsingular.MPolynomial_libsingular'
object has no attribute 'sqrt'
}
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/10720#comment:4>
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