|Bill Allombert on Thu, 06 Aug 2015 15:11:45 +0200|
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|Re: elllocalred vs. ellglobalred|
On Thu, Aug 06, 2015 at 01:13:30PM +0100, John Cremona wrote: > For E and elliptic curve over Q, the 3rd component of elllocalred(E,p) is > the [u,r,s,t]-transformation required to take E to a local minimal model at > p. The 5th component of ellglobalred(E) is supposed to be a list all the > elllocalred(E,p) for all bad primes; but in the output of > ellglobalred(E) all the 3rd components are 0! The documentation says: * L is a vector, whose i-th entry contains the local data at the i-th prime divisor of N, i.e. L[i] = elllocalred(E,F[i,1]), where the local coordinate change has been deleted, and replaced by a 0. This would duplicate the second component of ellglobalred() anyway. Cheers, Bill.