Bill Allombert on Thu, 13 Sep 2012 17:01:50 +0200 |
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Re: ell from j |
On Mon, Jun 11, 2012 at 07:56:48AM -0700, William Stein wrote: > Just a note -- that's what I did with Sage for a while, e.g., > > EllipticCurve(j) > > produced a curve with j-invariant j. This caused no end of confusion > and bugs in user code, since it is so similar to > > EllipticCurve(v) > > where v is a list of invariants or > > EllipticCurve(a4,a6). > > People were so annoyed by my choice, they deprecated it. Well, so I have just called the function ellfromj() and it returns an ell5: ? ellfromj(-3375) %1 = [0,0,0,-51667875,-175774110750] ? E=ellinit(%1); ? algdep(E.omega[1]/E.omega[2],2) %3 = 2*x^2-x+1 We can still change the interface though. Cheers, Bill.