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Metacommutation of primes in Eichler orders

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arxiv 1909.12915 v1 pith:SLA6KJTA submitted 2019-09-27 math.NT

Metacommutation of primes in Eichler orders

classification math.NT
keywords locallymetacommutationorderseichlerpermutationresultsactionalternative
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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In this article, we study the metacommutation problem in locally Eichler orders. From this arises a permutation of the set of locally principal left ideals of a given prime reduced norm. Previous results on the cycle structure were determined for locally maximal orders. As we extend these results, we present an alternative, combinatorial description of the metacommutation permutation as an action on the Bruhat-Tits tree.

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  1. Conjugation invariants determine the metacommutation permutation only up to relabelling

    cs.GT 2026-08 accept novelty 6.0

    Conjugation-invariant data can determine the cycle shape of the metacommutation permutation, but never the labelled permutation, and not even a single destination, as shown by four indistinguishable primes with four d...