電磁場テンソル
具体的には
( F 01 , F 02 , F 03 ) = ( − E x / c , − E y / c , − E z / c ) {\displaystyle (F_{01},F_{02},F_{03})=(-E_{x}/c,-E_{y}/c,-E_{z}/c)}
( F 23 , F 31 , F 12 ) = ( B x , B y , B z ) {\displaystyle (F_{23},F_{31},F_{12})=(B_{x},B_{y},B_{z})}
である。上付きの F μ ν = η μ ρ η ν σ F ρ σ {\displaystyle F^{\mu \nu }=\eta ^{\mu \rho }\eta ^{\nu \sigma }F_{\rho \sigma }} は
( F 01 , F 02 , F 03 ) = ( E x / c , E y / c , E z / c ) {\displaystyle (F^{01},F^{02},F^{03})=(E_{x}/c,E_{y}/c,E_{z}/c)}
( F 23 , F 31 , F 12 ) = ( B x , B y , B z ) {\displaystyle (F^{23},F^{31},F^{12})=(B_{x},B_{y},B_{z})}