Thank you. On 3 mar, 12:14, William Stein <[email protected]> wrote: > 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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