Finite-dimensionality conjecture for integral motivic extension spaces

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Let FF be a number field, let XX be a smooth projective variety over FF, and let M=hi−1(X)(n)M=h^{i-1}(X)(n). Write のExt⁡OF1(1,M)の\operatorname{Ext}^1_{\mathcal{O}_F}(\mathbb{1},M) for the subspace of extensions whose localization at every finite place p\mathfrak{p} belongs to Ext⁡Op1(1p,Mp)\operatorname{Ext}^1_{\mathcal{O}_{\mathfrak{p}}}(\mathbb{1}_{\mathfrak{p}},M_{\mathfrak{p}}). Finite-dimensionality conjecture. The space Ext⁡OF1(1,M)\operatorname{Ext}^1_{\mathcal{O}_F}(\mathbb{1},M) has finite dimension over Q\mathbb{Q}. This expectation is presented as the starting point for Beilinson's conjectures concerning integral motivic cohomology. The supplied context does not indicate whether this conjecture has been resolved.

References

Primary source

Quentin Gazda, “On the Integral Part of A-Motivic Cohomology”, arXiv:2201.09304 (2024).

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