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({e^{i*theta},theta\in Q},*) ÊÇAbelian G£º
·â±Õ e^{i*theta1}*e^{i*theta2}=e^{i*(theta1+theta2)}, theta1+theta2ÈÔΪÓÐÀíÊý.
½áºÏÂÉ(e^{i*theta1}*e^{i*theta2})*e^{i*theta3}=e^{i*theta1}*(e^{i*theta2}*e^{i*theta3})=e^{i*(theta1+theta2+theta3)}.
0ԪΪ1£¬¼´theta=0£¬e^{i*theta}*1=e^{i*theta}.
e^{i*theta}Óëe^{i*(-theta)}»¥ÎªÄæÔª£¬ÒòΪe^{i*theta}*e^{i*(-theta)}=1,
Abelian e^{i*theta1}*e^{i*theta2}=e^{i*(theta1+theta2)}=e^{i*(theta2+theta1)}=e^{i*theta2}*e^{i*theta1}.
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