M Caroccia, R Scala - Calculus of Variations and Partial Differential …, 2024 - Springer
Given any Γ= γ (S 1)⊂ R 2, image of a Lipschitz curve γ: S 1→ R 2, not necessarily injective,
we provide an explicit formula for computing the value of A (γ):= inf∫ B 1 (0)| det (∇ u)| dxu …