#3979: Power series composition messes up precision
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Reporter: kedlaya | Owner: somebody
Type: defect | Status: needs_work
Priority: critical | Milestone: sage-4.7.2
Component: algebra | Keywords: power series, composition, precision
Work_issues: | Upstream: N/A
Reviewer: | Author: Francis Clarke
Merged: | Dependencies:
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Comment(by fwclarke):
Replying to [comment:5 kedlaya]:
Yes, I'm sorry to have missed those failures.
I've been able to fix most of them. The code in
`schemes/elliptic_curves/formal_group.py` was problematic since iterated
univariate power series were used to approximate a power series ring in
two variables, but this should be simple to fix with the multiple variable
power series available in 4.7.1. More difficult to deal with may be the
failures in `schemes/hyperelliptic_curves/hyperelliptic_padic_field.py`
since the problem here is with substitutions in power series with a known
p-adic radius of convergence.
I'll get back to this in a couple of weeks.
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/3979#comment:6>
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