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第七节 群的同态与同构 一、同态定义 f 为 G1 到 G2 的同态当且仅当 f:G1G2, 且x,yG1,f(xy)=f(x)f(y) 实例: (1) 整数加群 的自同态: fc(x)=cx,c 为给定整数 (2) 模 n 加群 的自同态: fp(x)=(px)modn, p=0,1,…,n-1 (3) G1= ,G2= ,G1 到 G2 的满同态 f:ZZn, f(x)=(x)modn 说明:如果将群看成代数系统 ,则同态 f.
第七节 群的同态与同构 一、同态定义 f 为 G1 到 G2 的同态当且仅当 f:G1G2, 且x,yG1,f(xy)=f(x)f(y) 实例: (1) 整数加群 的自同态: fc(x)=cx,c 为给定整数 (2) 模 n 加群 的自同态: fp(x)=(px)modn, p=0,1,…,n-1 (3) G1= ,G2= ,G1 到 G2 的满同态 f:ZZn, f(x)=(x)modn 说明:如果将群看成代数系统 ,则同态 f.
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