English

A generalization of Ito's theorem to skew braces

Group Theory 2024-01-08 v2 Quantum Algebra Rings and Algebras

Abstract

The famous theorem of It\^{o} in group theory states that if a group G=HKG=HK is the product of two abelian subgroups HH and KK, then GG is metabelian. We shall generalize this to the setting of a skew brace (A,,)(A,{\cdot\,},\circ). Our main result says that if A=BCA = BC or A=BCA = B\circ C is the product of two trivial sub-skew braces BB and CC which are both left and right ideals in the opposite skew brace of AA, then AA is meta-trivial. One can recover It\^{o}'s Theorem by taking AA to be an almost trivial skew brace.

Keywords

Cite

@article{arxiv.2305.10081,
  title  = {A generalization of Ito's theorem to skew braces},
  author = {Cindy Tsang},
  journal= {arXiv preprint arXiv:2305.10081},
  year   = {2024}
}

Comments

35 pages; Proposition 2.4 and Corollary 2.6 were modified (there was a small mistake in the proof in version 1), and the hypothesis in Lemma 6.4 was slightly relaxed. Also fixed some typos