Abstract
We give the full structure of the Ext algebra of any Nichols algebra of Cartan type A2by using the Hochschild–Serre spectral sequence. As an application, we show that the pointed Hopf algebras [Formula: see text] with Dynkin diagrams of type A, D, or E, except for A1and A1× A1with the order NJ> 2 for at least one component J, are wild.
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