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Jiang-Nan Xu

Publications and source records attributed to Jiang-Nan Xu.

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Superalgebras and Algebras with Involution: Classifying Cubic Codimension Sequences

A $φ$-algebra is either a superalgebra or an algebra with involution. In this paper, we study $\operatorname{T}^φ$-ideals associated with unital $φ$-algebras whose $φ$-codimension sequence exhibits cubic polynomial growth. As a consequence, we obtain a complete classification of all $φ$-codimension sequences of cubic growth for unital $φ$-algebras. Furthermore, we explicitly determine a minimal-degree multilinear generator for every $\operatorname{T}^φ$-ideal associated with unital $φ$-algebras whose $φ$-codimension growth is at most quadratic.

math.RA

Operad and cohomology of associative algebras with generalized derivations

An associative algebra with a generalized derivation is called an AsGDer triple. We introduce the operad that encodes AsGDer triples, and prove it is a Koszul operad. Using its Koszul dual cooperad, we introduce the homotopy version of AsGDer triples. As an application, we construct the AsGDer cohomology theory for AsGDer triples, and show that the formal deformation of an AsGDer triple is controlled by the AsGDer cohomology.

math.RA