Dasgupta–Spieß conjecture on the Brumer–Stark unit formula
Let be totally real, let be a finite abelian extension in which splits completely, and let denote the Brumer–Stark unit constructed from the second formula, while denotes the Brumer–Stark unit appearing in the conjectural valuation formula. Dasgupta–Spieß conjecture. One has
The equality would remove the ambiguity between the constructed unit and the Brumer–Stark unit. The source gives no resolution status for this conjecture.
References
Primary source
Matthew H. L. Honnor, “On the Root of Unity Ambiguity in a Formula for the Brumer–Stark Units”, arXiv:2302.12332 (2025).
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