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The brick chain complexity of an artin algebra

Representation Theory 2026-06-26 v1

Abstract

We consider the category of finitely generated modules over an artin algebra AA. It is known that any module MM has a brick chain filtration. We say that M has brick chain complexity at most tt provided MM has a brick chain filtration of length at most tt. The brick chain complexity of A is by definition the supremum of the brick chain complexity of the indecomposable AA-modules. The aim of this note is to calculate the brick chain complexity for some algebras. We will exhibit algebras with arbitrarily large brick chain complexity.

Keywords

Cite

@article{arxiv.2606.27879,
  title  = {The brick chain complexity of an artin algebra},
  author = {Claus Michael Ringel},
  journal= {arXiv preprint arXiv:2606.27879},
  year   = {2026}
}

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9 pages