The application of Cayley–Bacharach Theorem to bivariate Lagrange interpolation

摘要

In this paper, we give a new proof of the famous Cayley–Bacharach theorem by means of interpolation, and deduce a general method of constructing properly posed set of nodes for bivariate Lagrange interpolation. As a result, we generalize the main results in Liang (On the interpolations and approximations in several variables, Jilin University, 1965), Liang and Lü (Approximation Theory IX, Vanderbilt University Press, 1988) and Liang et al. (Analysis, Combinatorics and Computing, Nova Science Publishers, Inc., New York, 2002) to the more extensive situations.