d M i d l = 1 2 ∂ ∂ k 2 F ( k , M ) | k = k 0 ∂ ∂ M i F ( k 0 , M ) . The renormalization group flow can be obtained directly as a stream plot of the right hand side of this differential equation. Numerically, this differential equation only requires the evaluation of the curvature function at few momenta. Hence, the method is a very efficient way to identify topological phase transitions, especially in periodically driven systems (aka Floquet systems) and interacting systems.