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Sep 20, 2011 at 23:36 comment added Todd Leason Ah, I see, $G$ can be realized as central quotient of the semi-direct product $G_0=H \times_\varphi \mathbb{Z}$ where $\varphi: \mathbb{Z} \to Aut(H), k \mapsto \phi^k$. That's good. Thanks a lot, Mark.
Sep 20, 2011 at 23:35 vote accept Todd Leason
Sep 20, 2011 at 22:06 history answered user6976 CC BY-SA 3.0