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In mathematics, the integral of a function of several variables defined on a line or curve that has been expressed in terms of arc length (seelength of a curve). An ordinary definite integral is defined over a line segment, whereas a line integral may use a more general path, such as a parabola or a circle. Line integrals are used extensively in the theory of functions of a complex variable.
This entry comes from Encyclopædia Britannica Concise. For the full entry on line integral, visit Britannica.com.
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