二次独立余模生成的交换代数上的Hopf余作用
Hopf coactions on commutative algebras generated by a quadratically independent comodule
摘要:
设A是特征不等于2的代数闭域k上的交换酉代数,其生成元构成有限维子空间V,不存在非平凡的齐次二次关系.设Q是一个霍普夫代数,它内忠实地作用在A上,而V不变.我们证明了Q必须是交换的,当:(i)余作用保持V上的非退化双线性型;或(ii)Q是余半单的,有限维的,并且char(k)= 0。
英文摘要:
Let A be a commutative unital algebra over an algebraically closed field k of characteristic not equal to 2, whose generators form a finite-dimensional subspace V, with no nontrivial homogeneous quadratic relations. Let Q be a Hopf algebra that coacts on A inner-faithfully, while leaving V invariant. We prove that Q must be commutative when either: (i) the coaction preserves a non-degenerate bilinear form on V; or (ii) Q is co-semisimple, finite-dimensional, and char(k)=0.
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