∂ γ γ ˙ ∂ γ γ ˙ ϕ α 1 . . . α k β ˙ 1 . . . β ˙ n ( k , n ) = 2 e 2 m 2 x α k + 1 β ˙ n + 1 x α k + 2 β ˙ n + 2 ϕ α 1 . . . α k α k + 1 α k + 2 β ˙ 1 . . . β ˙ n β ˙ n + 1 β ˙ n + 2 ( k + 2 , n + 2 ) \partial^{\gamma\dot{\gamma}}\partial_{\gamma\dot{\gamma}}\,\phi^{(k,n)}_{\alpha_{1}...\alpha_{k}\,\dot{\beta}_{1}...\dot{\beta}_{n}}=2e^{2}m^{2}\,x^{\alpha_{k+1}\dot{\beta}_{n+1}}\,x^{\alpha_{k+2}\dot{\beta}_{n+2}}\,\phi^{(k+2,n+2)}_{\alpha_{1}...\alpha_{k}\alpha_{k+1}\alpha_{k+2}\,\dot{\beta}_{1}...\dot{\beta}_{n}\dot{\beta}_{n+1}\dot{\beta}_{n+2}}