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$p$-adic regulator calculations

Why can't some $p$-adic regulators be calculated? The first case where this happens is the curve 3314b3. I received the following error message after using this code:

x = EllipticCurve("3314b3"); x
r=x.rank(); r
p=7
x.is_good(p) and x.is_ordinary(p)


RuntimeError: Unable to compute the rank, hence generators, with certainty (lower bound=0, generators found=[]). This could be because Sha(E/Q)[2] is nontrivial. Try increasing descent_second_limit then trying this command again.

$p$-adic regulator calculations

Why can't some $p$-adic regulators be calculated? The first case where this happens is the curve 3314b3. I received the following error message after using this code:

x = EllipticCurve("3314b3"); x
r=x.rank(); r = x.rank(); r
p=7
p = 7
x.is_good(p) and x.is_ordinary(p)


RuntimeError: Unable to compute the rank, hence generators, with certainty (lower bound=0, generators found=[]). This could be because Sha(E/Q)[2] is nontrivial. Try increasing descent_second_limit then trying this command again.

 3 retagged tmonteil 23773 ●25 ●171 ●437 http://wiki.sagemath.o...

$p$-adic regulator calculations

Why can't some $p$-adic regulators be calculated? The first case where this happens is the curve 3314b3. I received the following error message after using this code:

x = EllipticCurve("3314b3"); x
r = x.rank(); r
p = 7
x.is_good(p) and x.is_ordinary(p)