Double condensation of singularities for product-quadrature formulas with differentiable functions

The main goal of this paper is to emphasize the phenomenon of double condensation of singularities for spaces of differentiable functions with respect to product-quadrature formulas associated to a class of node triangular matrices in [−1, 1], including a Gegenbauer node matrix and the matrix of equidistant nodes in [−1, 1].

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Author(s)

Mitrea, Alexandru I.