Converse to derived isogeny implying quasi-liftable isogeny for abelian surfaces
Converse to derived isogeny implying quasi-liftable isogeny for abelian surfaces
Let and be abelian surfaces over with finite height and . They are quasi-liftably isogenous if they are isogenous through suitable liftings to characteristic zero. Converse conjecture. If and are quasi-liftable isogenous, then they are derived isogenous; equivalently, under these assumptions, and are derived isogenous if and only if they are quasi-liftable isogenous.
The forward implication is established in the cited theorem, and the authors state that they believe the converse also holds. Thus the converse remains open.
Sources & referencesView supporting material
Primary source
Zhiyuan Li and Haitao Zou, “Derived isogenies and isogenies for abelian surfaces”, arXiv:2108.08710 (2025).
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