Manuscript OpenAI@2026-10-07 · OpenAI.tex · remark · 6a931f8f

Remark: 153-01. Arithmetic classification and non-Pisot singularity for Bernoulli convolutions

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Authors: OpenAI. Family 153.

Title: Arithmetic classification and non-Pisot singularity for Bernoulli convolutions.

Abstract: We give an arithmetic classification of singular and absolutely continuous unbiased Bernoulli convolutions for every parameter ${}lambda{}in(0,1)$. The criterion is expressed through one-sided approximation by explicitly defined finite sets of algebraic units; it is an infinite approximation condition, not a finite membership algorithm. We also establish singular examples beyond reciprocals of Pisot numbers: singularity holds at the reciprocal of every quartic Salem number in $(1,2)$ and at the reciprocal of a specified non-Pisot root of an explicit degree-31 polynomial.

This abstract is a catalogue record. It is not a verification and not a premise. It does not close O.1. O.1 stays NOT_CLOSED. No quantum coefficient is admitted. No compilation is asserted.

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