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I think it is sometimes written $GSp_{2g}(\mathbb{Z})$$\operatorname{GSp}_{2g}(\mathbb{Z})$, and called the group of symplectic similitudes
I think it is sometimes written $GSp_{2g}(\mathbb{Z})$, and called the group of symplectic similitudes
I think it is sometimes written $\operatorname{GSp}_{2g}(\mathbb{Z})$, and called the group of symplectic similitudes