PPT Slide
Theorem 2.1 (Lagrange Polyminal Approximation). Assume that f C N+1[a, b] and and that x0, x1,... xN [a, b] are N + 1 nodes. If x [a, b] , then
f(x) = PN(x) + EN(x), (2.7)
PN(x) is a polynomial to approximate f (x):
2. Lagrange Approximation