The existence of an asymptotic expansion is proved for the Lebesgue constants associated with the polynomial interpolation at the "extended Chebyshev nodes." This series is quite different from the ...

SIAM Journal on Numerical Analysis, Vol. 39, No. 5 (2002), pp. 1780-1793 (14 pages) A problem of Hermite interpolation by polynomials of two variables is studied. The interpolation matches preassigned ...