English

Nakayama Algebras which are Higher Auslander Algebras

Representation Theory 2022-04-12 v4

Abstract

We prove that any cyclic Nakayama algebra which is a higher Auslander algebra can be uniquely constructed from Nakayama algebras of smaller ranks by reversing the syzygy filtration process. This creates chains of higher Auslander algebras upto ε\boldsymbol\varepsilon-equivalences. Therefore, the classification of all cyclic Nakayama algebras which are higher Auslander algebras reduces to the classification of linear ones. We give two applications of this: for any integer kk where 2k2n22\leq k\leq 2n-2, there is a Nakayama algebra of rank nn which is a higher Auslander algebra of global dimension kk and the possible values of the global dimensions of cyclic Nakayama algebras which are higher Auslander algebras form the sets {2,,2n2}{n1}\left\{2,\ldots,2n-2\right\}\setminus\left\{n-1\right\} if nn is even and {2,,2n2}{2,n1}\left\{2,\ldots,2n-2\right\}\setminus\left\{ 2,n-1\right\} if nn is odd.

Keywords

Cite

@article{arxiv.2009.03383,
  title  = {Nakayama Algebras which are Higher Auslander Algebras},
  author = {Emre Sen},
  journal= {arXiv preprint arXiv:2009.03383},
  year   = {2022}
}

Comments

Comments are welcome! v.4 Major revision according to referee report. Main results are same but proofs are elaborated. For linear case, we add new section. v.3 We change the term repetition with covering. CM. Ringel pointed out a bug in thm 1.7. Now, it is fixed by introducing new concept "Nakayama cycle" which is suggested by CM. Ringel. We add more examples