Divisibility conjecture for the tame reciprocity map

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Let XX be a smooth quasi-projective variety over the local field kk. Write

ρXt ⁣:Et(X)↠Jt(X)\rho^{\rm t}_X\colon E^{\rm t}(X)\twoheadrightarrow J^{\rm t}(X)

for the tame reciprocity map, where Et(X)E^{\rm t}(X) and Jt(X)J^{\rm t}(X) are the tame class group and tame abelianized fundamental-group target, respectively. Divisibility conjecture. The kernel of

ρXt ⁣:Et(X)↠Jt(X)\rho^{\rm t}_X\colon E^{\rm t}(X)\twoheadrightarrow J^{\rm t}(X)

is divisible. This predicts a refined form of the preceding tame class field theory results; the evidence is discussed in the paper's section on rational curves, but the general assertion is not resolved in the supplied text.

References

Primary source

Rahul Gupta, Amalendu Krishna and Jitendra Rathore, “Tame class field theory over local fields”, arXiv:2209.02953 (2026).

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