Hi, I think Units( R ), where R is a ring, will return the unit group of a ring R, which is a multiplicative group. A field is a ring, so it should work. According to the GAP manual (p. 568), it will be returned either as a list or group. If the return is list, then you can always Group() the list to make it a Group object.
Sincerely, Sandeep. On 5 Dec 2010, at 13:57, Johannes Wachs wrote: > Is there a way to call up the multiplicative group of order n? > > In particular I have written a program to output some set of positive > integers. I want to test if they are a subgroup of the multiplicative group > mod n. It would be great if I could use Subgroup(G, L); > > Alternatively, I think I could solve my problem by checking to see if my set > is closed under multiplication mod n. Is there a way to implement IsGroup > for some set mod n with multiplication? > > Johannes Wachs > _______________________________________________ > Forum mailing list > Forum@mail.gap-system.org > http://mail.gap-system.org/mailman/listinfo/forum _______________________________________________ Forum mailing list Forum@mail.gap-system.org http://mail.gap-system.org/mailman/listinfo/forum
