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Fullness of Connes spectra and the Connes Hopf kernel. (English) Zbl 0834.16037

Let \(H\) be a semisimple Hopf algebra, finite dimensional over its splitting field \(K\), and let \(A\) be an \(H\)-module algebra. Assume that the smash product \(A\# H\) is semiprime. Then it is shown here that the Connes spectrum \(\text{CS}(A,H)\) is full, that is consists of all irreducible \(H\)-modules, if and only if every nonzero annihilator ideal of \(A\# H\) meets \(A\) nontrivially. Furthermore, if \(H\) is cocommutative, then this paper studies the intersection \(I\) of the annihilators of the irreducible modules in \(\text{CS}(A,H)\). Specifically, it considers the Hopf kernel of the natural map from \(H\) to \(H/I\).

MSC:

16W30 Hopf algebras (associative rings and algebras) (MSC2000)
16S40 Smash products of general Hopf actions
16N60 Prime and semiprime associative rings
16S60 Associative rings of functions, subdirect products, sheaves of rings
Full Text: DOI

References:

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