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In mathematics, a summation equation or discrete integral equation is an equation in which an unknown function appears under a summation sign. The theories of summation equations and integral equations can be unified as integral equations on time scales[1] using time scale calculus. A summation equation compares to a difference equation as an integral equation compares to a differential equation.

The Volterra summation equation is:

\( x(t) = f(t) + \sum_{i=m}^n k(t, s, x(s)) \)

where x is the unknown function, and s, a, t are integers, and f, k are known functions.

References

Volterra integral equations on time scales: Basic qualitative and quantitative results with applications to initial value problems on unbounded domains, Tomasia Kulik, Christopher C. Tisdell, September 3, 2007

Undergraduate Texts in Mathematics

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Graduate Studies in Mathematics

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