Automorphism group of green algebra of weak Hopf algebra corresponding to Sweedler Hopf algebra
Liufeng Cao, Dong Su, Hua Yao (2023)
Czechoslovak Mathematical Journal
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Let be the Green ring of the weak Hopf algebra corresponding to Sweedler’s 4-dimensional Hopf algebra , and let be the automorphism group of the Green algebra . We show that the quotient group , where contains the identity map and is isomorphic to the infinite group and is the symmetric group of order 6.