Theorem 6.4 of Juschenko–Matte Bon–Monod–de la Salle on the breakpoints, for H(ℤ) — a subgroup of H(ℤ) is amenable if and only if its action on P_ℤ is extensively amenable

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Theorem 6.4 of Juschenko–Matte Bon–Monod–de la Salle on the breakpoints, for H(ℤ) — a subgroup of H(ℤ) is amenable if and only if its action on P_ℤ is extensively amenable · Prove2Me