Effaceability of derived ordinary parts for locally admissible representations

Let GG be a reductive group, let PGP^-\subset G be the opposite parabolic subgroup, and let Repladm(G)\mathfrak{Rep}^{\textnormal{ladm}}(G) denote the category of locally admissible representations. For i>0i>0, HiOrdPG\textnormal{H}^i\textnormal{Ord}^G_{P^-} denotes the ii-th cohomological ordinary-parts functor and RiOrdPG\textnormal{R}^i\textnormal{Ord}^G_{P^-} its right-derived functor in this category.

Effaceability conjecture. The functors HiOrdPG\textnormal{H}^i\textnormal{Ord}^G_{P^-} are effaceable on Repladm(G)\mathfrak{Rep}^{\textnormal{ladm}}(G) for i>0i>0. Consequently,

HiOrdPGRiOrdPG\textnormal{H}^i\textnormal{Ord}^G_{P^-}\simeq\textnormal{R}^i\textnormal{Ord}^G_{P^-}

for i>0i>0, where the derived functors are computed in Repladm(G)\mathfrak{Rep}^{\textnormal{ladm}}(G).

This is stated as one of the conjectural inputs for computing derived ordinary parts and is identified in the source with a question of Emerton; the supplied text gives no resolution status.

Sources & referencesView supporting material

Primary source

Karol Koziol, “Functorial properties of pro-p-Iwahori cohomology”, arXiv:2008.01757 (2021).

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