Geodesic
Algebras with Periodic Shifts of Ext Degrees
Matematičeskie zametki, Tome 86 (2009) no. 5, pp. 705-724.

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The so-called $\lambda$-Koszul algebra and $\lambda$-Koszul module are introduced. We give different equivalent descriptions of a $\lambda$-Koszul algebra in terms of its minimal graded projective resolution and the Yoneda $\operatorname{Ext}$-algebra $E(A)=\bigoplus_{i\ge 0}\operatorname{Ext}^i_A(\mathbb F,\mathbb F)$. The "$\lambda$-Koszulity" of a finitely generated graded module is discussed and the concepts of (strongly) weakly $\lambda$-Koszul module are introduced. Finally, we discuss the $A_{\infty}$-structure on the Yoneda $\operatorname{Ext}$-algebra of a $\lambda$-Koszul algebra.
Mots-clés : $\lambda$-Koszul algebras (modules)
Keywords: (strongly) weakly $\lambda$-Koszul, Yoneda $\operatorname{Ext}$-algebras, $A_{\infty}$-algebras, Lie algebra, module over a graded algebra. 
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Lu Jiafeng. Algebras with Periodic Shifts of Ext Degrees. Matematičeskie zametki, Tome 86 (2009) no. 5, pp. 705-724. http://geodesic.mathdoc.fr/item/MZM_2009_86_5_a7/

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