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Abstract
We give a direct combinatorial proof that a certain n-dimensional algebra A is a comodule algebra over the Taft Hopf algebra of dimension n 2.
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ACKNOWLEDGMENT
The authors wish to thank Jason Fulman for suggesting the proof of Theorem 4.2.
Both authors were supported by NSF grant DMS 07-01291.
Notes
Communicated by H.-J. Schneider.
Dedicated to Mia Cohen, coauthor and friend, on the occasion of her retirement.