#5367: bug in composition of power series
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Reporter: AlexGhitza | Owner: tbd
Type: defect | Status: new
Priority: major | Milestone: sage-4.0
Component: algebra | Keywords: power series composition
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Comment(by davidloeffler):
I just came across this, which is presumably related:
{{{
sage: R.<x> = QQ[[]]
sage: f = 1 + 24*x^11 + 24*x^22 + O(x^33)
sage: f(x^2)
1 + 24*x^22 + 24*x^44 + O(x^86)
}}}
The answer should clearly be 1 + 24*x^22 + 24*x^44 + O(x^66). (This is
causing some headaches in trying to sort out degeneracy maps for modular
forms.)
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/5367#comment:2>
Sage <http://sagemath.org/>
Sage - Open Source Mathematical Software: Building the Car Instead of
Reinventing the Wheel
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