(I - K)^{-1} = Σ K^n converges if ||K|| < 1. Successive-approximation solution to integral equations. Foundation of perturbation theory + iterative numerical methods. Generalises geometric series.
(I - K)^{-1} = Σ K^n converges if ||K|| < 1. Successive-approximation solution to integral equations. Foundation of perturbation theory + iterative numerical methods. Generalises geometric series.