张量初步 数学记号 δij={0,i≠j1,i=jϵijk={1,(123)偶置换−1,(123)奇置换0,otherwise\delta_{ij}=\left\{ \begin{matrix} 0,i\ne j\\ 1,i=j \end{matrix}\right.\\ \epsilon_{ijk}=\lef...
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