Volterra integral equation
（重定向自Volterra Integral Equation of the First Kind）
In mathematics, the Volterra integral equations are a special type of integral equations. They are divided into two groups referred to as the first and the second kind.
A linear Volterra equation of the first kind is
where ƒ is a given function and x is an unknown function to be solved for. A linear Volterra equation of the second kind is