Polynomiality conjecture for faithful dimensions over finite truncated valuation rings

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Let g\mathfrak{g} be a nilpotent Z\mathbb{Z}-Lie algebra finitely generated as an abelian group. For a finite truncated valuation ring RR with maximal ideal m\mathfrak{m}, write dd for the least positive integer with md=0\mathfrak{m}^d=0, let p=char⁡(R/m)p=\operatorname{char}(R/\mathfrak{m}), let pR=mepR=\mathfrak{m}^e, and write R/m≅FpfR/\mathfrak{m}\cong\mathbb{F}_{p^f}; call (d,p,e,f)(d,p,e,f) its associated parameters. Let M(g)M(\mathfrak{g}), partitions {P1,…,Pr}\{\mathscr{P}_1,\ldots,\mathscr{P}_r\} and {F1,…,Fs}\{\mathscr{F}_1,\ldots,\mathscr{F}_s\}, and polynomials gij(T)g_{ij}(T) be as in the polynomiality theorem for mfaithful(GFq)m_{\mathrm{faithful}}(\mathscr{G}_{\mathbb{F}_q}). Polynomiality conjecture. These data can be chosen such that, for every finite truncated valuation ring RR with associated parameters (d,p,e,f)(d,p,e,f),

mfaithful(GR)=f∑ℓ=0e−1gij(pf(d−ℓ))m_{\mathrm{faithful}}(\mathscr{G}_R)=f\sum_{\ell=0}^{e-1}g_{ij}\bigl(p^{f(d-\ell)}\bigr)

whenever (p,f)∈Pi×Fj(p,f)\in\mathscr{P}_i\times\mathscr{F}_j. This conjecture extends the polynomiality result over finite fields to finite truncated valuation rings, asserting that the faithful dimension depends on the ring through the associated parameters in the specified polynomial form.

References

Primary source

Mohammad Bardestani, Keivan Mallahi-Karai, Dzmitry Rumiantsau and Hadi Salmasian, “Polynomiality of the faithful dimension of nilpotent groups over finite truncated valuation rings”, arXiv:2204.12412 (2023).

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