How is 3-form made?

A 3-form is a type of differential form used in differential geometry and mathematical physics, typically defined on a three-dimensional manifold. It is mathematically represented as a fully antisymmetric tensor field, which can be constructed from a set of functions and differentials. In practical terms, a 3-form can be expressed using a basis of differential forms, often involving the wedge product of three differential one-forms. For example, in three-dimensional space, a 3-form can be represented as ( f(x, y, z) , dx \wedge dy \wedge dz ), where ( f ) is a smooth function.