Comparison of four finite element solutions of self‐adjoint and non‐self‐adjoint problems governed by differential equations with predominant lower order derivatives

Considering typical self‐adjoint and non‐self‐adjoint problems that are governed by differential equations with predominant lower order derivatives, a comparison is presented of their finite element solutions by Ritz, Galerkin, least square (LSQ) and discrete least square (DLSQ) methods.