17.110 (2010)

Open

a) Is it true that for each word $w$, there is a function $h: \mathbb{N} \times \mathbb{N} \to \mathbb{N}$ such that the width of $w$ in every finite $p$-group of Prüfer rank $r$ is bounded by $h(p, r)$?
b) If so, can $h(p, r)$ be made independent of $p$?

Progress

An affirmative answer to a) would imply A. Jaikin-Zapirain's result (ibid.) that every word has finite width in each $p$-adic analytic pro-$p$ group, since a pro-$p$ group is $p$-adic analytic if and only if the Prüfer ranks of all its finite quotients are uniformly bounded.

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