Elementary classification by cores for graph products in the specified classes

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Let G(Γ,{Gv}v∈Γ)\mathcal G(\Gamma,\{G_v\}_{v\in\Gamma}) and G(Γ′,{Gv′}v∈Γ′)\mathcal G(\Gamma',\{G'_v\}_{v\in\Gamma'}) belong to the specified class G(FN,CΦr)\mathcal G(\mathbf F_N,\mathbf C^r_\Phi) with N>0N>0. Assume either that Φ\Phi consists only of nontrivial positive sentences and the graphs are positive reduced, or that Φ\Phi consists of non-generic almost positive sentences and the graphs are almost positive reduced. Graph-product core classification conjecture. Then

G(Γ,{Gv}v∈Γ)≡G(Γ′,{Gv′}v∈Γ′)\mathcal G(\Gamma,\{G_v\}_{v\in\Gamma})\equiv\mathcal G(\Gamma',\{G'_v\}_{v\in\Gamma'})

if and only if there is an isomorphism

f:Core⁡(Γ)→Core⁡(Γ′)f:\operatorname{Core}(\Gamma)\to\operatorname{Core}(\Gamma')

and Gv≡Gf(v)′G_v\equiv G'_{f(v)}. This would extend the RAAG core principle to the indicated classes of graph products.

References

Primary source

Montserrat Casals-Ruiz, Ilya Kazachkov and Javier de la Nuez González, “On the elementary theory of graph products of groups”, arXiv:2106.03782 (2021).

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