Where L is a linear operator, N is a non-linear operator and g(t) is a known analytical function.
Ji-Huan He has modified the above method into an iteration method in the following way:
Where L is a general Lagrange multiplier, which can be identified optimally via the variational theory[1], the subscript n denotes the nth approximation, and u is considered as a restricted variation[2], i.e. u = 0