Antisymmetric covariant tensor fields, with exterior derivative d satisfying d²=0. Cleans up Maxwell's equations to dF=0, d⋆F=⋆J; gives Stokes' theorem in arbitrary dimension; underlies de Rham cohomology and gauge theory.
Antisymmetric covariant tensor fields, with exterior derivative d satisfying d²=0. Cleans up Maxwell's equations to dF=0, d⋆F=⋆J; gives Stokes' theorem in arbitrary dimension; underlies de Rham cohomology and gauge theory.