Hello all,
I believe I have come closer to understanding the problem; I believe
the root issue is with negative-valuation coefficients of power series
over p-adics, rather than with Dp_valued_series itself. As I
understand it, the bug in power series comparison masked this issue so
that
EllipticCurve('53a1').sha().an_padic(5)
worked as expected until the power series comparison bug was patched.
An extensive description is on the ticket page:
http://trac.sagemath.org/sage_trac/ticket/9457#comment:12
best,
Niles
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