A generalization of Ito's theorem to skew braces

preprint2023arXivOpen access

Abstract

The famous theorem of Itô 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=B∘CA = 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 Itô's Theorem by taking AA to be an almost trivial skew brace.

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