Order of Convergence of One-Step Methods for Volterra Integral Equations of the Second Kind

Nice proofs of convergence and asymptotic expansions are known for one-step methods for ordinary differential equations. It is shown that these proofs can be generalized in a natural way to “extended” one-step methods for Volterra integral equations of the second kind. Furthermore, the convergence of “mixed” one-step methods is investigated. For both types general Volterra–Runge–Kutta methods are considered as examples.