Kourovka Notebook Problem 21.128

Two groups G1G_1 and G2G_2 are said to be commensurable if there exist finite-index subgroups H1⩽G1H_1\leqslant G_1 and H2⩽G2H_2\leqslant G_2 (not necessarily of the same index) such that H1≅H2H_1\cong H_2. Let A[F4]A[F_4] and A[H4]A[H_4] denote the Artin groups of spherical types F4F_4 and H4H_4, respectively. Are these two groups commensurable?

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