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====các phương pháp khác====these include mesh-free methods like the analytic element method (aem) and the boundary element method (bem), which are closer to analytic solutions, but they do approximate the groundwater flow equation in some way.
====other methods====these include mesh-free methods like the analytic element method (aem) and the boundary element method (bem), which are closer to analytic solutions, but they do approximate the groundwater flow equation in some way.