EXT ALGEBRA OF NICHOLS ALGEBRAS OF CARTAN TYPE A2
2013 ◽
Vol 12
(04)
◽
pp. 1250191
Keyword(s):
Type A
◽
We give the full structure of the Ext algebra of any Nichols algebra of Cartan type A2 by 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 A1 and A1 × A1 with the order NJ > 2 for at least one component J, are wild.