Endomorphisms of Weyl algebras are studied using bimodules. Initially, for a Weyl algebra over a field of characteristic zero, Bernstein's inequality implies that holonomic bimodules finitely generated from the right (respectively, left) form a monoidal category.

中文翻译：

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Weyl代数同构图

Weyl代数的内同态使用双模块进行研究。最初，对于特征零域上的Weyl代数，伯恩斯坦不等式意味着从右边（分别为左边）有限生成的完整双模形成一个单调类别。