关于Ext代数生成次数的界的一个注记

A note on the bound of the generation degree for Ext-algebras

为了研究分次代数的Yoneda代数的有限生成性,Green和Marcos于2005年引进了δ-Koszul代数的概念并提出了三个公开问题.本文通过讨论分段Koszul代数的相关性质,给出了第三个问题的答案.

In order to investigate the finite generation of the Yoneda-Ext algebra of a graded algebra, Green and Marcos introduced the notion of δ-Koszul algebra in 2005, and raised three questions. In this paper, by discussing piecewise-Koszul algebra, we give an answer to the third question.