Could you please help me on this? Or just give me a hint how to start.

Task: Calculate $\mid O_3(\mathbb{Z}/3\mathbb{Z})\mid$ and $\mid O_4(\mathbb{Z}/2\mathbb{Z})\mid$ where $O_n$ represents alle the $n\times n$ matrices where $A^{-1} = A^T$ so that $A \cdot A^T= I_n$ the $n \times n$ where $n \times n$ identity matrix.

  • $\begingroup$ Looks like a subcase of this. No answers other than a reference to Wilson's book. $\endgroup$ – Jyrki Lahtonen Jun 29 '17 at 8:02
  • $\begingroup$ Formulas $\endgroup$ – Jyrki Lahtonen Jun 29 '17 at 8:03

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