What exactly do you mean by the dual of an ideal? Do you mean dual
with respect to the trace pairing, so the dual of the ideal (1) is the
inverse different?

David

On 4 September 2012 04:15, Cindy <[email protected]> wrote:
> Hi,
>
> How can I calculate the dual of an ideal using sage?
>
> Thanks.
>
> Cindy
>
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