A pro-pp group with full normal Hausdorff spectra

preprint2020arXivOpen access

Abstract

For each odd prime pp, we produce a 22-generated pro-pp group GG whose normal Hausdorff spectra hspec⊴S(G)={hdimGS(H)∣H⊴cG} \mathrm{hspec}_{\trianglelefteq}^{\mathcal{S}}(G) = \{ \mathrm{hdim}_{G}^{\mathcal{S}}(H)\mid H\trianglelefteq_\mathrm{c} G \} with respect to five standard filtration series S\mathcal{S} - namely the lower pp-series, the dimension subgroup series, the pp-power series, the iterated pp-power series and the Frattini series - are all equal to the full unit interval [0,1][0,1]. Here hdimGS ⁣:{X∣X⊆G}→[0,1]\mathrm{hdim}_G^{\mathcal{S}} \colon \{ X\mid X \subseteq G \} \to[0,1] denotes the Hausdorff dimension function associated to the natural translation-invariant metric induced by the filtration series S\mathcal{S}.

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