A Nyström interpolant for some weakly singular nonlinear Volterra integral equations

We consider a second kind weakly singular nonlinear Volterra–Hammerstein integral equation defined by a compact operator and derive a Nyström type interpolant of the solution based on Gauss–Radau nodes. We prove the convergence of the interpolant and derive convergence estimates. For equations with nonlinearity of algebraic kind, we improve the rate of convergence by using a smoothing transformation. Some numerical examples are given.