マクスウェルの応力テンソル
{ λ } = { − ε 0 E 2 2 , − ε 0 E 2 2 , + ε 0 E 2 2 } {\displaystyle \{\lambda \}=\left\{-{\frac {\epsilon _{0}E^{2}}{2}},~-{\frac {\epsilon _{0}E^{2}}{2}},~+{\frac {\epsilon _{0}E^{2}}{2}}\right\}}
{ v } = { E × E y , − E × E z , E E x } {\displaystyle \{{\boldsymbol {v}}\}=\left\{{\boldsymbol {E}}\times {\boldsymbol {E}}_{y},~-{\boldsymbol {E}}\times {\boldsymbol {E}}_{z},~{\boldsymbol {E}}E_{x}\right\}}