Google Groups no longer supports new Usenet posts or subscriptions. Historical content remains viewable.
Dismiss
Modular group gamma sibling?
0 views
Skip to first unread message
Mikito Harakiri
Jul 17, 2004, 1:33:42 AM7/17/04
to
I'm studying semigroup that is generated by multiplication of 2x2
matrixes like this:
matrixes like this:
N=Matrix(2,2,[[n,1],[1,0]])
where n integer >=1. Unlike modular group gamma the decomposition of
any element
Matrix(2,2,[[a,b],[c,d]])=N_1.N_2.N_3...N_k
is always unique. The other distinction is that the determinant is
always either 1 or -1. What is the name of this subgroup?
0 new messages