# Tag Info

The idea about the calculus of variations is to start from an optimal solution $y_i^\ast(p)$ (assuming there exists one) and to look at small perturbations of the form: $$y_i(p) = y_i^\ast(p) + \varepsilon \eta(p).$$ Here $\eta(p)$ is a (smooth) continuous function of $p$ and $\varepsilon \in \mathbb{R}$. Depending on the boundary or shape conditions of \$...