Modules and operator rings of Reynolds algebras

Abstract

We develop a module theory for weighted Reynolds algebras by constructing an associa?tive ring that records the algebra action and the module operator. The categories of left and right Reynolds modules are equivalent to the corresponding module categories over this ring, and their tensor products agree under these equivalences. We construct free Reynolds modules and give an explicit graded description of the operator ring for idempotent classical Reynolds operators fixing the identity. When the Reynolds operator on the algebra is bijective, modules with bijective module operators correspond to differential modules satisfying an invertibility condition. The operator ring transfers the Hom-tensor adjunction, Morita theory and derived functors to Reynolds modules. Explicit computations over a field show that the identity operator gives an operator ring of global dimension one, whereas the zero operator gives one of infinite global dimension.

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BibTeX RIS

BibTeX

@misc{he2026modules,
  title = {{Modules and operator rings of Reynolds algebras}},
  author = {Jun He and Xiao-Song Peng and Chenghao Zhang and Yi Zhang},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.21829},
  eprint = {2610.21829},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.21829},
}

RIS

TY  - UNPB
TI  - Modules and operator rings of Reynolds algebras
AU  - Jun He
AU  - Xiao-Song Peng
AU  - Chenghao Zhang
AU  - Yi Zhang
PY  - 2026
DA  - 2026/10/15
PB  - arXiv
DO  - 10.48550/arxiv.2610.21829
UR  - https://arxiv.org/abs/2610.21829
AB  - We develop a module theory for weighted Reynolds algebras by constructing an associa?tive ring that records the algebra action and the module operator. The categories of left and right Reynolds modules are equivalent to the corresponding module categories over this ring, and their tensor products agree under these equivalences. We construct free Reynolds modules and give an explicit graded description of the operator ring for idempotent classical Reynolds operators fixing the identity. When the Reynolds operator on the algebra is bijective, modules with bijective module operators correspond to differential modules satisfying an invertibility condition. The operator ring transfers the Hom-tensor adjunction, Morita theory and derived functors to Reynolds modules. Explicit computations over a field show that the identity operator gives an operator ring of global dimension one, whereas the zero operator gives one of infinite global dimension.
ER  -

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