PreprintCC BY 4.0arXiv
Restricted monodromy containing transpositions
Abstract
We relate the monodromy group of a branched cover to the monodromy groups of its restrictions. We show that the presence of a transposition in a restricted monodromy group significantly constrains the monodromy group of the original branched cover. Using this result, we complete the sparse trace test algorithm, which numerically verifies whether a set of solutions to a sparse polynomial system is complete. Along the way, we develop a generalization of the notion of a trace test in the setting of branched covers.
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BibTeX
@misc{barnhart2026restricted,
title = {{Restricted monodromy containing transpositions}},
author = {Julianne Barnhart and Taylor Brysiewicz and Michael Burr and Thomas Yahl},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.23238},
eprint = {2609.23238},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.23238},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Restricted monodromy containing transpositions
AU - Julianne Barnhart
AU - Taylor Brysiewicz
AU - Michael Burr
AU - Thomas Yahl
PY - 2026
DA - 2026/09/19
PB - arXiv
DO - 10.48550/arxiv.2609.23238
UR - https://arxiv.org/abs/2609.23238
AB - We relate the monodromy group of a branched cover to the monodromy groups of its restrictions. We show that the presence of a transposition in a restricted monodromy group significantly constrains the monodromy group of the original branched cover. Using this result, we complete the sparse trace test algorithm, which numerically verifies whether a set of solutions to a sparse polynomial system is complete. Along the way, we develop a generalization of the notion of a trace test in the setting of branched covers.
ER -