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We show that an infinite residually finite boundedly generated group has an infinite chain of finite index subgroups with ranks uniformly bounded, and give (sublinear) upper bounds on the ranks of arbitrary finite index subgroups of boundedly generated groups (examples that come close to achieving these bounds are presented). This proves a strong form of a conjecture of Abert, Jaikin‐Zapirain, and Nikolov that asserts that the rank gradient of infinite boundedly generated residually finite groups is zero. Furthermore, our first result establishes a variant of a conjecture of Lubotzky on the ranks of finite index subgroups of special linear groups over the integers, and is analogous to a result of Pyber and Segal for solvable groups.

Ranks of subgroups in boundedly generated groups