Re: [sage-support] Question regarding normalization of modular symbols.

2016-11-09 Thread John Cremona
On 9 November 2016 at 00:25, francisco wrote: > Hello, > > I have been computing modular symbols for distinct curves on the Cremona > data base. > But, in a few curves, I recived a WARNING messages like this: > > Warning : Could not normalize the modular symbols, maybe all

[sage-support] Question regarding normalization of modular symbols.

2016-11-08 Thread francisco
Hello, I have been computing modular symbols for distinct curves on the Cremona data base. But, in a few curves, I recived a WARNING messages like this: Warning : Could not normalize the modular symbols, maybe all further results will be multiplied by -1, 2 or -2. Why sage does not give the