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2022 Canonical Comultiplication and Double Centraliser Property
Nan Gao, Jing Ma, Juxia Zhang
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Taiwanese J. Math. Advance Publication 1-14 (2022). DOI: 10.11650/tjm/220903


In this paper, we show the existence of the attached comultiplication structure on $\operatorname{Hom}_{eAe}(eA,D(Ae))$ if an $(eAe,A)$-bimodule $eA$ has the double centraliser property over an algebra $A$ with the idempotent $e$. Then we apply it on gendo-Gorenstein algebras. As applications, we give a sufficient and necessary condition for a gendo-Gorenstein algebra to be Gorenstein, and give a bocs-theoretic characterisation of the double centraliser property.

Funding Statement

The first author is supported by the National Natural Science Foundation of China (Grant Nos. 11771272 and 11871326).


The part of this paper was written during the first author's visit to Stuttgart in 2019. She would like to express their gratitude to Steffen Koenig for hospitality and many useful discussions.


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Nan Gao. Jing Ma. Juxia Zhang. "Canonical Comultiplication and Double Centraliser Property." Taiwanese J. Math. Advance Publication 1 - 14, 2022.


Published: 2022
First available in Project Euclid: 14 September 2022

Digital Object Identifier: 10.11650/tjm/220903

Primary: 13E10 , 16E65 , 16G10

Keywords: comultiplication , dominant dimension , double centraliser property , gendo-Gorenstein algebra

Rights: Copyright © 2022 The Mathematical Society of the Republic of China


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