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出 处:《数学学报(中文版)》2006年第2期347-352,共6页Acta Mathematica Sinica:Chinese Series
基 金:国家自然科学基金资助项目(10371101)
摘 要:设A是由箭图Q和关系I所确定的代数,D(A)是代数A的对偶扩张代数, 对应的箭图Q*和关系I*由Q和I决定.本文证明:带关系箭图(Q*,I*)的自同构由带关系箭图(Q,I)的自同构决定;D(A)的Frobenius态射由A的Frobenius态射完全决定;代数D(A)的固定点代数同构于相应的代数A的固定点代数与A°P的固定点代数的张量积,特别地,当Q为单的箭图时,代数D(A)的固定点代数同构于代数A的固定点代数的对偶扩张代数.Let A be the algebra defined by a quiver Q and a relationship I, D(A) the dual extension of A. D(A) is defined by the the quiver Q^* and relations I^*. In this paper, the following results are shown. The quiver automorphism of the quiver (Q^*, I^*) is determined by the quiver automorphism of (Q, I); the Frobenius morphism of D(A) is determined by the Frobenius morphism of A; the fixed-point algebra of D(A) is isomorphisic to the tensor of the fixed-point algebra of A and the fixed-point algebra of A^op. Specially, in the case when Q is simple quiver, the fixed-point algebra of D(A) is isomorphisic to the dual extension of the fixed-point algebra of A.
关 键 词:对偶扩张 Frobenius态射 固定点代数
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