设A是由箭图O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O^*和关系I^*由O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(O,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^op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.