The stratification closure-maps conjecture for quantized coordinate rings

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Let AA and HH be as in Theorem \textup{(c)}. For J⊂J′J\subset J' in H-Spec⁡AH\text{-}\operatorname{Spec} A, let ϕJJ′p\phi^p_{JJ'} and ϕJJ′s\phi^s_{JJ'} be the maps between closed subsets of the primitive and prime strata, respectively. Stratification closure-maps conjecture. There exist an affine variety VJJ′V_{JJ'}, a corresponding scheme V~JJ′\widetilde V_{JJ'}, and morphisms

Prim⁡J′A→VJJ′,Prim⁡JA→VJJ′,Spec⁡J′A→V~JJ′,Spec⁡JA→V~JJ′\operatorname{Prim}_{J'} A \to V_{JJ'},\qquad \operatorname{Prim}_J A \to V_{JJ'},\qquad \operatorname{Spec}_{J'} A \to \widetilde V_{JJ'},\qquad \operatorname{Spec}_J A \to \widetilde V_{JJ'}

with the displayed maps denoted by fJJ′f_{JJ'}, gJJ′g_{JJ'}, f~JJ′\widetilde f_{JJ'}, and g~JJ′\widetilde g_{JJ'}, such that

ϕJJ′p(Y)=fJJ′−1(gJJ′(Y)‾)\phi^p_{JJ'}(Y)=f_{JJ'}^{-1}\bigl(\overline{g_{JJ'}(Y)}\bigr)

for Y∈CL(Prim⁡JA)Y\in {\rm{CL}}(\operatorname{Prim}_J A), and

ϕJJ′s(Z)=f~JJ′−1(g~JJ′(Z)‾)\phi^s_{JJ'}(Z)=\widetilde f_{JJ'}^{-1}\bigl(\overline{\widetilde g_{JJ'}(Z)}\bigr)

for Z∈CL(Spec⁡JA)Z\in {\rm{CL}}(\operatorname{Spec}_J A). The conjecture seeks a classical-geometric description of the relations between strata in the prime and primitive spectra; the immediately preceding discussion notes that simpler descriptions by inverse images or closures of images under morphisms do not always work.

References

Primary source

K. R. Goodearl, “Spectra of quantum algebras”, arXiv:2211.14967 (2022).

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