Dirichlet's Principle
In this video, I give you a taste of calculus of variations by illustrating Dirichlet's principle, which says that a function u is a minimizer of a certain Dirichlet energy (kinetic + potential energy) if and only if u solves Poisson's equation. This is a neat way of relating minimizers of energies with PDEs.
Introduction to Calculus of Variations: kzitem.info/news/bejne/1qlpz6Wjr5GdlYI
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