ADVANCES IN MATHEMATICS 20, 1-17 (1976) On Cubic Spline Functions that Vanish at All Knots*

In [4], Birkhoff and de Boor improved on earlier results by Ahlberg and Nilson [l] concerning the convergence of cubic spline interpolants to a smooth interpoland. Shortly thereafter, Sharma and Meir [20] gave much more general results using much simpler means of proo