Kronecker representation, Multi-grid, Iterative numerical methods for linear systems, Kronecker product, Iterative methods, Steady-state analysis, Markov chain, Multigrid, Aggregation, Computational methods for sparse matrices, Disaggregation, Markovian, iterative method, Weak interactions, Low memory, multigrid, Numerical experiments, Kronecker representations, Decomposition, decomposition, Markov processes, aggregation, Local transitions, Iterative method, disaggregation, Acceleration of convergence in numerical analysis, Vector and tensor algebra, theory of invariants, Continuous-time Markov processes on discrete state spaces