A product quadrature rule, based on the filtered de la Vallée Poussin polynomial approximation, is proposed for evaluating finite weighted Hilbert transform in [ − 1 , ] . Convergence results are stated uniform norm functions belonging to suitable Besov type subspaces. Several numerical tests provided, also comparing rule with other formulas known literature.

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In this paper, we propose a new method for the numerical solution of two-dimensional linear and nonlinear Volterra integral equations of the first and second kinds, which avoids from using starting values. An existence and uniqueness theorem is proved and convergence isverified by using an appropriate variety of the Gronwall inequality. Application of the method is demonstrated for solving the ...

In this paper, we tried to evaluate the fractional derivatives by using the Chebyshev series expansion. We discuss the indefinite quadrature rule to estimate the fractional derivatives of Riemann-Liouville type.

In order to approximate the integral I( f ) = ∫ b a f (x)dx, where f is a sufficiently smooth function, models for quadrature rules are developed using a given panel of n (n ≥ 2) equally spaced points. These models arise from the undetermined coefficients method, using a Newton’s basis for polynomials. Although part of the final product is algebraically equivalent to the well known closed Newto...

The Riemann integral can be approximated using partitions and a rule for assigning weighted sums of the function at points determined by the partition. Approximation methods commonly used include endpoint rules, the midpoint rule, the trapezoid rule, Simpson’s rule, and other quadrature methods. The rate of approximation depends to a large degree on the rule being used and the smoothness of the...