ガンマ行列
4次元時空では { γ μ } μ = 0 , 1 , 2 , 3 {\displaystyle \{\gamma ^{\mu }\}_{\mu =0,1,2,3}} 同士の積から生成される 2 = 16 個の元
1 , {\displaystyle \mathbf {1} ,}
γ 0 , i γ 1 , i γ 2 , i γ 3 , {\displaystyle \gamma ^{0},i\gamma ^{1},i\gamma ^{2},i\gamma ^{3},}
γ 0 γ 1 , γ 0 γ 2 , γ 0 γ 3 , i γ 2 γ 3 , i γ 3 γ 1 , i γ 1 γ 2 , {\displaystyle \gamma ^{0}\gamma ^{1},\gamma ^{0}\gamma ^{2},\gamma ^{0}\gamma ^{3},i\gamma ^{2}\gamma ^{3},i\gamma ^{3}\gamma ^{1},i\gamma ^{1}\gamma ^{2},}
γ 1 γ 2 γ 3 , i γ 0 γ 2 γ 3 , i γ 0 γ 1 γ 3 , i γ 0 γ 1 γ 2 , {\displaystyle \gamma ^{1}\gamma ^{2}\gamma ^{3},i\gamma ^{0}\gamma ^{2}\gamma ^{3},i\gamma ^{0}\gamma ^{1}\gamma ^{3},i\gamma ^{0}\gamma ^{1}\gamma ^{2},}