The nonnested augmented subspace method proposed for solving the Kohn-Sham equation can be extended to address a broader range of electronic structure problems in quantum mechanics. By adapting the algorithm to accommodate different Hamiltonian operators and boundary conditions, it can be applied to systems beyond the Kohn-Sham equation. For instance, it can be utilized to solve the Schrödinger equation for molecules, crystals, or other quantum systems. The key lies in customizing the method to suit the specific requirements and characteristics of the electronic structure problem at hand. By adjusting the basis functions, mesh refinement strategies, and numerical techniques, the nonnested augmented subspace method can be tailored to tackle various electronic structure problems efficiently and accurately.