2487	 Cubic Spline solutions to Fourth-order Boundary Value Problems	 The cubic spline approximation to the fourth-order differential equation y p x y q x y r x y t x is shown to reduce to the solution of a five-term recurrence relationship. For some special cases the approximation is shown to be simply related to a finite difference representation with a local truncation error of order y delta . cubic spline differential equations boundary value problem
