Secondary calculus and cohomological physics

Secondary calculus and cohomological physics are advanced topics that emerge from the field of mathematics and theoretical physics. Here is an overview of each: ### Secondary Calculus Secondary calculus, also referred to in some literature as "secondary calculus of variations" or "higher-order calculus," is an extension of classical calculus that deals with variations of functionals, especially in the context of higher derivatives and secondary derivatives. In classical calculus of variations, one typically solves problems involving the optimization of functional (e.g.