### Integral equation - Wikipedia, the free encyclopedia

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# Integral equation

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In mathematics, an **integral equation** is an equation in which an unknown function appears under an integral sign. There is a close connection between differential and integral equations, and some problems may be formulated either way. See, for example, Maxwell's equations.

## Contents

[hide]## Overview[edit]

The most basic type of integral equation is called a *Fredholm equation of the first type*: