A note on the Ritz approach to the extremal curves

Đ. S. Đukić, T. M. Atanacković

Approximation of extremals by the Ritz method is considered. The corresponding extremals belong to the class $\mathbf D_1$, $\mathbf D_2$ or $\mathbf D_3$. Approximative lines of classes $\mathbf D_1$ are used for solving problems.