Integral equivariant Iwasawa main conjecture for arbitrary sets of primes

Let FF) be a totally real field, let pp be a prime, let H/FH_{\infty}/F be the relevant infinite extension with Galois group G\mathcal{G}, and let SS, SramS_{ram}, and SpS_p denote respectively a set of primes, the primes ramified in the extension, and the primes above pp. Let XSX_S^{-} be the minus part of the corresponding Iwasawa module, and let Θ((SSram)Sp){v0}(H)\Theta_{((S\cap S_{ram})\cup S_p)}^{\{v_0\}}(H_{\infty}), QvQ_v, \TildeJv\Tilde{J}_v^{\infty}, and RvR_v be the associated equivariant elements or ideals. Here v0v_0 is a prime with pv0p\nmid v_0. Integral equivariant Iwasawa main conjecture. For any set SS of primes,

FittZp[[G]](XS)=(Θ((SSram)Sp){v0}(H)vSram(S{v0}Sp)QvSpS\TildeJvSSramRv;pv0).\operatorname{Fitt}_{\mathbb{Z}_p[[\mathcal{G}]]^-}(X_S^{-})=\left( \Theta_{((S\cap S_{ram})\cup S_p)}^{\{v_0\}}(H_{\infty})\prod_{v\in S_{ram}\setminus (S\cup \{v_0\}\cup S_p)} Q_v \prod_{S_p\setminus S}\Tilde{J}_v^{\infty}\prod_{S\cap S_{ram}}R_v;p\nmid v_0 \right).

The conjecture extends the integral equivariant refinement of the Iwasawa main conjecture to the case without an auxiliary nonempty set TT. The paper notes that the inclusion in one direction follows from the surjection XS{v0},XSX_S^{\{v_0\},-}\to X_S^-; the reverse inclusion remains conjectural.

Sources & referencesView supporting material

Primary source

Rusiru Gambheera, “An Integral Equivariant Refinement of the Iwasawa Main Conjecture for Totally Real Fields”, arXiv:2503.23320 (2025).

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