JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE) ›› 2022, Vol. 57 ›› Issue (6): 31-35.doi: 10.6040/j.issn.1671-9352.0.2021.523

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Characterizations of monoids by K-separation property

WANG Ya-ting, QIAO Hu-sheng*   

  1. College of Mathematics and Statistics, Northwest Normal University, Lanzhou 730070, Gansu, China
  • Published:2022-06-10

Abstract: Let S be a monoid, K be an arbitrary non-empty subset of S. This paper studies the K-separation properties of Rees factors and amalgamated coproducts, gives the characterizations of K-separation property by pullback diagrams, and discusses the homological classification problem of K-separation property on free(projective, principally weakly flat)Rees factor S-acts.

Key words: K-separation, principally weak flatness, torsion free

CLC Number: 

  • O152.7
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[1] LI Yuan, YAO Hai-lou. On torsion free class and cover class in category of comodules [J]. JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE), 2020, 55(8): 1-5.
[2] QIAO Hu-sheng, SHI Xue-qin. On homological classification of weakly torsion free Rees factor S-posets [J]. JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE), 2018, 53(8): 49-52.
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