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asked 10 years ago

Jimeree gravatar image

Constructing subgroups by intersection

I'd like to construct a subgroup of Sp(4,Z) of the form:

G0(N)=M(N)Sp(4,Z)

where M(N) is a 4×4 matrix over the integer ring with elements that are multiples of the integer N. I think I know how to construct such an M(N) for a given N, but how does one then construct such a subgroup G0(N)? Thanks!