#15737: Problem in an_padic
-------------------------------------+-------------------------------------
Reporter: wuthrich | Owner:
Type: defect | Status: needs_review
Priority: major | Milestone: sage-6.2
Component: elliptic curves | Resolution:
Keywords: padic l-functions | Merged in:
Authors: Chris Wuthrich | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
u/wuthrich/ticket/15737 | afe228dbcd688562d4aed0872376af918f67c023
Dependencies: | Stopgaps:
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Comment (by pbruin):
Would it be possible to solve the problem instead by fixing the `series`
method of `pAdicLSeriesOrdinary`, and similarly of
`pAdicLSeriesSupersingular`, rather than the call to it? I mean something
like this:
{{{
#!diff
diff --git a/src/sage/schemes/elliptic_curves/padic_lseries.py
b/src/sage/schemes/elliptic_curves/padic_lseries.py
index c964189..ced0472 100644
--- a/src/sage/schemes/elliptic_curves/padic_lseries.py
+++ b/src/sage/schemes/elliptic_curves/padic_lseries.py
@@ -882,8 +882,11 @@ class pAdicLseriesOrdinary(pAdicLseries):
print 'Warning : For p=2 the normalization might not be
correct !'
#verbose("computing L-series for p=%s, n=%s, and
prec=%s"%(p,n,prec))
- bounds = self._prec_bounds(n,prec)
- padic_prec = max(bounds[1:]) + 5
+ if prec <= 1:
+ padic_prec = 5
+ else:
+ bounds = self._prec_bounds(n, prec)
+ padic_prec = max(bounds[1:]) + 5
verbose("using p-adic precision of %s"%padic_prec)
res_series_prec = min(p**(n-1), prec)
}}}
This would also make the following work:
{{{
sage: Et=EllipticCurve([-1,0])
sage: lp=Et.padic_lseries(13)
sage: lp.series(3, prec=1)
6 + 12*13 + O(13^3) + O(T)
}}}
--
Ticket URL: <http://trac.sagemath.org/ticket/15737#comment:3>
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