An Extended Variational Principle

The paradigm of the calculus of variations is the functional 1.1 I ( v ) = ∫ Ω W ( Δ v ) d x . https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9780203744369/d9858e60-9246-4876-bb34-38e3d28ecc5f/content/eq1259.tif"/>