On Wed, Mar 3, 2010 at 10:09 AM, Adrián <[email protected]> wrote:
> Hi, I'm trying to work through some parts of William Stein's book on
> the Birch and Swinnerton-Dyer conjecture, and I'm doing some examples
> in SAGE. Everything seems to work fine, but I always get an error
> message when I try to compute the real period, I even tried the same
> example that is on the book, with the elliptic curve
> EllipticCurve('11a') but it didn't work. I have already installed the
> Cremona database. The error I get when I do the computation E.omega()
> is the following:
>
> sage:E.omega()
> sage: AttributeError: 'EllipticCurve_rational_field' object has no
> attribute 'omega'
>
> Could anyone please help me with this?
sage: E = EllipticCurve('389a')
sage: E.period_lattice().omega()
4.98042512171011
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