Multiple integral 重积分
(重定向自Multiple integration)
The multiple integral is a generalization of the definite integral to functions of more than one real variable, for example, f(x, y) or f(x, y, z). Integrals of a function of two variables over a region in R are called double integrals, and integrals of a function of three variables over a region of R are called triple integrals.