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k ∂ k Γ k [ φ ] = 1 2 T r ( Γ k ( 2 ) + R k ) − 1 k ∂ k R k {\displaystyle k\partial _{k}\Gamma _{k}[\varphi ]={\frac {1}{2}}{\rm {Tr}}\left(\Gamma _{k}^{(2)}+R_{k}\right)^{-1}k\partial _{k}R_{k}}