Hello,

the following is not directly related but might still be of interest
for you: as you can see in ticket #8327 and in

http://groups.google.com/group/sage-combinat-devel/browse_thread/thread/421cc6117d027dc9/9cce8b12b9c81d9f?#9cce8b12b9c81d9f

we started to implement cyclotomic fields in the way it is done in GAP
as a vector space with a distinguished basis called Zumbroich basis.
Using this basis it is very fast to find the smallest CF a given
linear combination of roots of unity lives in. This makes it easy to
add or multiply roots of unities living in different CFs and consider
the expression in the smallest CF it lives in.

The project is still in an early phase but if it will turn out to work
well it is maybe interesting to merge it with the version of
cyclotomic fields already being used in sage.

Comments and ideas are very welcome!

Cheers, Christian

-- 
To post to this group, send an email to sage-devel@googlegroups.com
To unsubscribe from this group, send an email to 
sage-devel+unsubscr...@googlegroups.com
For more options, visit this group at http://groups.google.com/group/sage-devel
URL: http://www.sagemath.org

Reply via email to