Ihara lemma, indefinite case
Ihara lemma, indefinite case
Assume the indefinite Shimura-variety setup of the source. Let and be the relevant Shimura varieties, let be the local system, and let denote the localization ideal. Ihara lemma, indefinite case. If , if for and is finite free over , if is residually absolutely irreducible, and if the Satake parameter of modulo contains at most once, then
is surjective. This is stated as a generalization of the Ihara lemma for modular curves, or unitary Shimura curves, in the source.
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Primary source
Yifeng Liu, Yichao Tian, Liang Xiao, Wei Zhang and Xinwen Zhu, “Survey on bounding Selmer groups for Rankin–Selberg motives”, arXiv:2509.16881 (2025).
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