Divergence Theorem: The divergence theorem relates a triple integral over a region in space to a surface integral over its boundary. It extends the idea of Green's theorem into three dimensions.
Stokes' Theorem: Stokes' theorem is an extension of Green's theorem to higher dimensions. It relates the curl of a vector field over a surface to the line integral around its boundary.
Flux: Flux measures how much of something (such as fluid or energy) flows through a given surface. It can be calculated using either Green's theorem or the divergence theorem.