RT @gabrielpeyre@twitter.com
The Legendre transform is one of the fundamental tool of convex analysis, which is also at the heart of Lagrangian/Hamiltonian mechanics. x^2/2 is the only fixed point of the transform. https://en.wikipedia.org/wiki/Legendre_transformation
🐦🔗: https://twitter.com/gabrielpeyre/status/1334014435761942530