$$\varphi(e_{i})=(f_{1}(e_{i}),\cdot\cdot\cdot, f_{n}(e_{i}))=( \overbrace{ 0,\cdot\cdot\cdot,0 }^{i-1\text{個}},1,0,\cdot\cdot\cdot,0), i=1,2,\cdot\cdot\cdot,n.$$
\varphi(e_{i})=(f_{1}(e_{i}),\cdot\cdot\cdot, f_{n}(e_{i}))=( \overbrace{ 0,\cdot\cdot\cdot,0 }^{i-1\text{個}},1,0,\cdot\cdot\cdot,0), i=1,2,\cdot\cdot\cdot,n.
參考：https://blog.csdn.net/qq_17528659/article/details/82152530
