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猜测: 如果半群S与S'同态(\phi), 则S有单位元e \implies S'也有单位元,且为\phi(e)
#179
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qingwen-guan
opened
4 years ago
qingwen-guan
commented
4 years ago
可以写成$S$和$S'$有一个同态满射$\phi$
可以写成$S$和$S'$有一个同态满射$\phi$