Multivariable calculus
Special multivariable uses include partial derivatives, or differentiation with only one dimension at a time, and multiple integration, or integrating over more than one dimension. The gradient operator , defined in terms of partial derivatives, is used to defined higher concepts such as Laplace operator, divergence and curl. By integrating a multivariable function over several variables, one can define an integral over an area, surface or volume as well.