Multivariable calculus is the branch of calculus that studies functions of more than one variable. Partial derivatives and multiple integrals are the generalizations of derivative and integral that are used. An important theorem in multivariable calculus is Green's theorem, which is a generalization of the first fundamental theorem of calculus to two dimensions.
Multivariable Calculus
See also
Calculus, Green's Theorem, Multiple Integral, Multivariate Analysis, Partial Derivative Explore this topic in the MathWorld classroomThis entry contributed by John Renze
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Renze, John. "Multivariable Calculus." From MathWorld--A Wolfram Web Resource, created by Eric W. Weisstein. https://mathworld.wolfram.com/MultivariableCalculus.html