Contour line

A contour line of a function of two variables is a curve along which the function has a constant value, so that the curve joins points of equal value to the state. It is a plane section of the three-dimensional graph of the function parallel to the -plane. More generally, a contour line for a function of two variables is a curve connecting points where the function has the same particular value.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY 2.5

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