In the mathematical fields of differential geometry and tensor calculus, differential forms are an approach to multivariable calculus that's independent of coordinates. A differential form of degree k, or (differential) k-form, on a smooth manifold M's a smooth section of the kth exterior power of the cotangent bundle of M. The set of all k-forms on M's a vector space commonly denoted Ωk(M). A differential 0-form's by definition a smooth function on M. A differential 1-form's an object dual… (More on 0-form)