There are exactly 116 different groups P where $7\mathbf{Z}^{3} \subset P \subset \mathbf{Z}^{3}$
I don't know how to prove this. Is it provable at all? How?
There are exactly 116 different groups P where $7\mathbf{Z}^{3} \subset P \subset \mathbf{Z}^{3}$
I don't know how to prove this. Is it provable at all? How?