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An equivariant version of Gabber's lemma
Abstract
Let G be a finite abelian group, and let k be an infinite perfect field containing a primitive root of unity of order the exponent of G. We prove that the G-equivariant version of Gabber's presentation lemma proposed by Bachmann holds over k if and only if G is cyclic of p-power order, for some prime p.
Related
BibTeX
@misc{belfiori2026equivariant,
title = {{An equivariant version of Gabber's lemma}},
author = {Filippo Belfiori},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.21771},
eprint = {2609.21771},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.21771},
}
RIS
TY - UNPB
TI - An equivariant version of Gabber's lemma
AU - Filippo Belfiori
PY - 2026
DA - 2026/09/18
PB - arXiv
DO - 10.48550/arxiv.2609.21771
UR - https://arxiv.org/abs/2609.21771
AB - Let G be a finite abelian group, and let k be an infinite perfect field containing a primitive root of unity of order the exponent of G. We prove that the G-equivariant version of Gabber's presentation lemma proposed by Bachmann holds over k if and only if G is cyclic of p-power order, for some prime p.
ER -