On 2014-05-06 17:24, John Cremona wrote:
The ring of integers is computed by the pari library. I don't know if
pari checks to see if the field is cyclotomic and uses a short-cut if
it is. We should check that, and of not then Sage could put in the
shortcut instead;
Sage does have a shortcut to compute the ring of integers of a
cyclotomic field. But PARI computes it very quickly anyway, so there is
nothing to worry about.
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