The conjecture that random generalized power series are irreducible

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Let KK be a field and let b∈K((R≤0))b\in K((\mathbb{R}^{\leq 0})) be a random generalized power series, meaning that either cl⁡(supp⁡(b))−{0}\operatorname{cl}(\operatorname{supp}(b))-\{0\} is Q\mathbb{Q}-linearly independent or the tuple of coefficients indexed by supp⁡(b)\operatorname{supp}(b) is algebraically independent over Q\mathbb{Q}. Let sup⁡(b)\sup(b) be the supremum of the support, ot⁡(b)\operatorname{ot}(b) its order type, and define deg⁡(b)\deg(b) as the maximum ordinal α\alpha such that ωα≤ot⁡(b)\omega^\alpha\leq\operatorname{ot}(b). Random-series irreducibility conjecture. If sup⁡(b)=0\sup(b)=0, then bb is irreducible, and so is b+rb+r for every series rr satisfying

ot⁡(r)<ωdeg⁡(b).\operatorname{ot}(r)<\omega^{\deg(b)}.

The paper proves this assertion for substantial families of order types and notes that the conjecture would extend those results to all random series; its general status is not specified.

References

Primary source

Antongiulio Fornasiero, Noa Lavi, Sonia L'Innocente and Vincenzo Mantova, “Irreducibility in generalized power series”, arXiv:2405.13815 (2024).

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