English

Arithmetical invariants of local quaternion orders

Rings and Algebras 2026-01-13 v3

Abstract

Let DD be a DVR, let KK be its quotient field, and let RR be a DD-order in a quaternion algebra AA over KK. The elasticity of RR^\bullet is \rho(R^\bullet) = \sup\{\, k/l : u_1\cdots u_k = v_1 \cdots v_l \text{ with u_i,, v_jatomsof atoms of R^\bulletand and k,, l \ge 1} \,\} and is one of the basic arithmetical invariants that is studied in factorization theory. We characterize finiteness of ρ(R)\rho(R^\bullet) and show that the set of distances Δ(R)\Delta(R^\bullet) and all catenary degrees cd(R)\mathsf c_\mathsf d(R^\bullet) are finite. In the setting of noncommutative orders in central simple algebras, such results have only been understood for hereditary orders and for a few individual examples.

Keywords

Cite

@article{arxiv.1706.00572,
  title  = {Arithmetical invariants of local quaternion orders},
  author = {Nicholas R. Baeth and Daniel Smertnig},
  journal= {arXiv preprint arXiv:1706.00572},
  year   = {2026}
}

Comments

33 pages; final revision (some typos fixed)