The double integral, denoted as ∬, is a mathematical operation that computes the accumulation of a function over a two-dimensional region. This operation allows us to find areas, volumes, and other quantities by integrating a function of two variables, essentially summing up all the infinitesimal contributions within a specified domain. It forms the backbone for further theorems and applications in multivariable calculus, linking concepts of area and volume with vector fields and surface integrals.
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