Dasgupta–Spieß conjecture on the Brumer–Stark unit formula

Let FF be totally real, let H/FH/F be a finite abelian extension in which p\mathfrak{p} splits completely, and let u2u_2 denote the Brumer–Stark unit constructed from the second formula, while upu_{\mathfrak{p}} denotes the Brumer–Stark unit appearing in the conjectural valuation formula. Dasgupta–Spieß conjecture. One has

u2=up.u_2=u_{\mathfrak{p}}.

The equality would remove the ambiguity between the constructed unit u2u_2 and the Brumer–Stark unit. The source gives no resolution status for this conjecture.

Sources & referencesView supporting material

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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