Multiple integral

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Volume under a surface - this is what a multiple integral for a function with two variables typically looks like.

In analysis, an integral is a way to calculate a limit value, a function with one variable will tend towards. Graphically, this can then be shown as the area under the graph of the function. It is also possible to calculate integrals for functions with more than one variable. An integral for a function with two variables can be shown as a surface in three dimensional space. Integrals for functions with more than one variable are commonly called multiple integrals.