Super approximation conjecture for finitely generated subgroups of SL⁡n(Z)\operatorname{SL}_n(\mathbb Z)

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Let Γ<SL⁡n(Z)\Gamma<\operatorname{SL}_n(\mathbb Z) be finitely generated, and let G\mathbb G be the Zariski closure of Γ\Gamma, with identity component G0\mathbb G_0. The group G0\mathbb G_0 is perfect when

[G0,G0]=G0.[\mathbb G_0,\mathbb G_0]=\mathbb G_0.

Super approximation conjecture. The group Γ\Gamma has the super approximation property with respect to all positive integers if and only if G0\mathbb G_0 is perfect.

References

Primary source

Jincheng Tang and Xin Zhang, “Sum-product phenomenon in quotients of rings of algebraic integers”, arXiv:2308.08867 (2024).

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