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Difference between revisions of "Linear integral equation"

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An integral equation in which the unknown function <img align="absmiddle" border="0" src="https://www.encyclopediaofmath.org/legacyimages/l/l059/l059320/l0593201.png" /> occurs in a linear fashion:
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An integral equation in which the unknown function $\phi(s)$ occurs in a linear fashion:
  
<table class="eq" style="width:100%;"> <tr><td valign="top" style="width:94%;text-align:center;"><img align="absmiddle" border="0" src="https://www.encyclopediaofmath.org/legacyimages/l/l059/l059320/l0593202.png" /></td> </tr></table>
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$$A(x)\phi(x)+\int\limits_DK(x,s)\phi(s)ds=f(x),\quad x\in D.$$
  
Here <img align="absmiddle" border="0" src="https://www.encyclopediaofmath.org/legacyimages/l/l059/l059320/l0593203.png" />, <img align="absmiddle" border="0" src="https://www.encyclopediaofmath.org/legacyimages/l/l059/l059320/l0593204.png" />, <img align="absmiddle" border="0" src="https://www.encyclopediaofmath.org/legacyimages/l/l059/l059320/l0593205.png" /> are given functions, <img align="absmiddle" border="0" src="https://www.encyclopediaofmath.org/legacyimages/l/l059/l059320/l0593206.png" /> is a domain of the Euclidean space, <img align="absmiddle" border="0" src="https://www.encyclopediaofmath.org/legacyimages/l/l059/l059320/l0593207.png" /> and <img align="absmiddle" border="0" src="https://www.encyclopediaofmath.org/legacyimages/l/l059/l059320/l0593208.png" /> are points of the space, and <img align="absmiddle" border="0" src="https://www.encyclopediaofmath.org/legacyimages/l/l059/l059320/l0593209.png" /> is the volume element. For more details see [[Integral equation|Integral equation]].
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Here $A$, $K$, $f$ are given functions, $D$ is a domain of the Euclidean space, $k$ and $s$ are points of the space, and $ds$ is the volume element. For more details see [[Integral equation|Integral equation]].

Latest revision as of 16:46, 7 July 2014

An integral equation in which the unknown function $\phi(s)$ occurs in a linear fashion:

$$A(x)\phi(x)+\int\limits_DK(x,s)\phi(s)ds=f(x),\quad x\in D.$$

Here $A$, $K$, $f$ are given functions, $D$ is a domain of the Euclidean space, $k$ and $s$ are points of the space, and $ds$ is the volume element. For more details see Integral equation.

How to Cite This Entry:
Linear integral equation. Encyclopedia of Mathematics. URL: http://encyclopediaofmath.org/index.php?title=Linear_integral_equation&oldid=32384
This article was adapted from an original article by A.B. Ivanov (originator), which appeared in Encyclopedia of Mathematics - ISBN 1402006098. See original article